removed remaining unnecessary imports for lgtm

src/app/core/data/data.service.ts

@@ -2,18 +2,7 @@ import { HttpClient } from '@angular/common/http';
 import { Store } from '@ngrx/store';
 import { Operation } from 'fast-json-patch';
 import { Observable } from 'rxjs';
-import {
-  distinctUntilChanged,
-  filter,
-  find,
-  first,
-  map,
-  mergeMap,
-  skipWhile,
-  switchMap,
-  take,
-  tap
-} from 'rxjs/operators';
+import { distinctUntilChanged, filter, find, first, map, mergeMap, switchMap, take } from 'rxjs/operators';
 import { hasValue, isNotEmpty, isNotEmptyOperator } from '../../shared/empty.util';
 import { NotificationOptions } from '../../shared/notifications/models/notification-options.model';
 import { NotificationsService } from '../../shared/notifications/notifications.service';
@@ -28,24 +17,12 @@ import { CoreState } from '../core.reducers';
 import { DSpaceSerializer } from '../dspace-rest-v2/dspace.serializer';
 import { DSpaceObject } from '../shared/dspace-object.model';
 import { HALEndpointService } from '../shared/hal-endpoint.service';
-import {
-  configureRequest,
-  getRemoteDataPayload,
-  getResponseFromEntry,
-  getSucceededRemoteData
-} from '../shared/operators';
+import { configureRequest, getRemoteDataPayload, getResponseFromEntry, getSucceededRemoteData } from '../shared/operators';
 import { URLCombiner } from '../url-combiner/url-combiner';
 import { ChangeAnalyzer } from './change-analyzer';
 import { PaginatedList } from './paginated-list';
 import { RemoteData } from './remote-data';
-import {
-  CreateRequest,
-  DeleteByIDRequest,
-  FindByIDRequest,
-  FindListOptions,
-  FindListRequest,
-  GetRequest, PatchRequest, PutRequest
-} from './request.models';
+import { CreateRequest, DeleteByIDRequest, FindByIDRequest, FindListOptions, FindListRequest, GetRequest, PatchRequest, PutRequest } from './request.models';
 import { RequestEntry } from './request.reducer';
 import { RequestService } from './request.service';
 import { RestRequestMethod } from './rest-request-method';

src/app/core/data/lookup-relation.service.ts

@@ -1,6 +1,6 @@
 import { ExternalSourceService } from './external-source.service';
 import { SearchService } from '../shared/search/search.service';
-import { concat, map, multicast, startWith, take, takeWhile, tap } from 'rxjs/operators';
+import { concat, map, multicast, startWith, take, takeWhile } from 'rxjs/operators';
 import { PaginatedSearchOptions } from '../../shared/search/paginated-search-options.model';
 import { ReplaySubject } from 'rxjs/internal/ReplaySubject';
 import { RemoteData } from './remote-data';

src/app/core/json-patch/builder/json-patch-operations-builder.ts

@@ -1,13 +1,9 @@
 import { Store } from '@ngrx/store';
 import { CoreState } from '../../core.reducers';
-import {
-  NewPatchAddOperationAction, NewPatchMoveOperationAction,
-  NewPatchRemoveOperationAction,
-  NewPatchReplaceOperationAction
-} from '../json-patch-operations.actions';
+import { NewPatchAddOperationAction, NewPatchMoveOperationAction, NewPatchRemoveOperationAction, NewPatchReplaceOperationAction } from '../json-patch-operations.actions';
 import { JsonPatchOperationPathObject } from './json-patch-operation-path-combiner';
 import { Injectable } from '@angular/core';
-import { hasNoValue, hasValue, isEmpty, isNotEmpty } from '../../../shared/empty.util';
+import { hasNoValue, isEmpty, isNotEmpty } from '../../../shared/empty.util';
 import { dateToISOFormat } from '../../../shared/date.util';
 import { AuthorityValue } from '../../integration/models/authority.value';
 import { FormFieldMetadataValueObject } from '../../../shared/form/builder/models/form-field-metadata-value.model';

src/app/shared/form/builder/ds-dynamic-form-ui/existing-metadata-list-element/existing-metadata-list-element.component.ts

@@ -1,14 +1,6 @@
-import {
-  Component,
-  EventEmitter,
-  Input,
-  OnChanges,
-  OnDestroy,
-  OnInit,
-  Output
-} from '@angular/core';
+import { Component, EventEmitter, Input, OnChanges, OnDestroy, OnInit, Output } from '@angular/core';
 import { FormControl } from '@angular/forms';
-import { DynamicFormArrayGroupModel, DynamicFormControlEvent } from '@ng-dynamic-forms/core';
+import { DynamicFormArrayGroupModel } from '@ng-dynamic-forms/core';
 import { Store } from '@ngrx/store';
 import { BehaviorSubject, Subscription } from 'rxjs';
 import { filter } from 'rxjs/operators';
@@ -19,17 +11,14 @@ import { Item } from '../../../../../core/shared/item.model';
 import { ItemMetadataRepresentation } from '../../../../../core/shared/metadata-representation/item/item-metadata-representation.model';
 import { MetadataRepresentation } from '../../../../../core/shared/metadata-representation/metadata-representation.model';
 import { MetadataValue } from '../../../../../core/shared/metadata.models';
-import {
-  getAllSucceededRemoteData,
-  getRemoteDataPayload
-} from '../../../../../core/shared/operators';
+import { getAllSucceededRemoteData, getRemoteDataPayload } from '../../../../../core/shared/operators';
 import { hasValue, isNotEmpty } from '../../../../empty.util';
 import { ItemSearchResult } from '../../../../object-collection/shared/item-search-result.model';
 import { SelectableListService } from '../../../../object-list/selectable-list/selectable-list.service';
 import { FormFieldMetadataValueObject } from '../../models/form-field-metadata-value.model';
 import { RelationshipOptions } from '../../models/relationship-options.model';
 import { DynamicConcatModel } from '../models/ds-dynamic-concat.model';
-import { RemoveRelationshipAction, UpdateRelationshipAction } from '../relation-lookup-modal/relationship.actions';
+import { RemoveRelationshipAction } from '../relation-lookup-modal/relationship.actions';
 
 // tslint:disable:max-classes-per-file
 /**

src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/dynamic-lookup-relation-modal.component.ts

@@ -2,7 +2,7 @@ import { Component, EventEmitter, NgZone, OnDestroy, OnInit, Output } from '@ang
 import { combineLatest, Observable, Subscription, zip as observableZip } from 'rxjs';
 import { NgbActiveModal } from '@ng-bootstrap/ng-bootstrap';
 import { hasValue } from '../../../../empty.util';
-import { map, skip, switchMap, take, tap, filter } from 'rxjs/operators';
+import { map, skip, switchMap, take } from 'rxjs/operators';
 import { SEARCH_CONFIG_SERVICE } from '../../../../../+my-dspace-page/my-dspace-page.component';
 import { SearchConfigurationService } from '../../../../../core/shared/search/search-configuration.service';
 import { SelectableListService } from '../../../../object-list/selectable-list/selectable-list.service';

src/app/submission/sections/sections.service.ts

@@ -1,7 +1,7 @@
 import { Injectable } from '@angular/core';
 
 import { combineLatest, Observable } from 'rxjs';
-import { distinctUntilChanged, filter, map, take, tap } from 'rxjs/operators';
+import { distinctUntilChanged, filter, map, take } from 'rxjs/operators';
 import { Store } from '@ngrx/store';
 import { TranslateService } from '@ngx-translate/core';
 import { ScrollToConfigOptions, ScrollToService } from '@nicky-lenaers/ngx-scroll-to';
@@ -17,17 +17,8 @@ import {
   SectionStatusChangeAction,
   UpdateSectionDataAction
 } from '../objects/submission-objects.actions';
-import {
-  SubmissionObjectEntry,
-  SubmissionSectionError,
-  SubmissionSectionObject
-} from '../objects/submission-objects.reducer';
-import {
-  submissionObjectFromIdSelector,
-  submissionSectionDataFromIdSelector,
-  submissionSectionErrorsFromIdSelector,
-  submissionSectionFromIdSelector
-} from '../selectors';
+import { SubmissionObjectEntry, SubmissionSectionError, SubmissionSectionObject } from '../objects/submission-objects.reducer';
+import { submissionObjectFromIdSelector, submissionSectionDataFromIdSelector, submissionSectionErrorsFromIdSelector, submissionSectionFromIdSelector } from '../selectors';
 import { SubmissionScopeType } from '../../core/submission/submission-scope-type';
 import parseSectionErrorPaths, { SectionErrorPath } from '../utils/parseSectionErrorPaths';
 import { FormAddError, FormClearErrorsAction, FormRemoveErrorAction } from '../../shared/form/form.actions';