Fix LGTM issues

src/app/+admin/admin-access-control/epeople-registry/eperson-form/eperson-form.component.ts

@@ -8,7 +8,7 @@ import {
 } from '@ng-dynamic-forms/core';
 import { TranslateService } from '@ngx-translate/core';
 import { combineLatest as observableCombineLatest, Observable, of as observableOf, Subscription } from 'rxjs';
-import { switchMap, take, tap } from 'rxjs/operators';
+import { switchMap, take } from 'rxjs/operators';
 import { PaginatedList } from '../../../../core/data/paginated-list.model';
 import { RemoteData } from '../../../../core/data/remote-data';
 import { EPersonDataService } from '../../../../core/eperson/eperson-data.service';

src/app/+admin/admin-access-control/group-registry/group-form/members-list/members-list.component.ts

@@ -23,7 +23,6 @@ import {
 import { NotificationsService } from '../../../../../shared/notifications/notifications.service';
 import { PaginationComponentOptions } from '../../../../../shared/pagination/pagination-component-options.model';
 import { PaginationService } from '../../../../../core/pagination/pagination.service';
-import { hasValue } from '../../../../../shared/empty.util';
 import {EpersonDtoModel} from '../../../../../core/eperson/models/eperson-dto.model';
 
 /**

src/app/+browse-by/+browse-by-title-page/browse-by-title-page.component.ts

@@ -1,7 +1,7 @@
 import { combineLatest as observableCombineLatest } from 'rxjs';
 import { Component } from '@angular/core';
 import { ActivatedRoute, Params, Router } from '@angular/router';
-import { hasValue, isNotEmpty } from '../../shared/empty.util';
+import { hasValue } from '../../shared/empty.util';
 import {
   BrowseByMetadataPageComponent,
   browseParamsToOptions

src/app/+collection-page/collection-page.component.ts

@@ -1,7 +1,7 @@
 import { ChangeDetectionStrategy, Component, OnInit } from '@angular/core';
 import { ActivatedRoute, Router } from '@angular/router';
 import { BehaviorSubject, combineLatest as observableCombineLatest, Observable, Subject } from 'rxjs';
-import { filter, map, mergeMap, startWith, switchMap, take, tap } from 'rxjs/operators';
+import { filter, map, mergeMap, startWith, switchMap, take } from 'rxjs/operators';
 import { PaginatedSearchOptions } from '../shared/search/paginated-search-options.model';
 import { SearchService } from '../core/shared/search/search.service';
 import { SortDirection, SortOptions } from '../core/cache/models/sort-options.model';

src/app/+item-page/full/field-components/file-section/full-file-section.component.ts

@@ -1,5 +1,5 @@
 import { Component, Input, OnInit } from '@angular/core';
-import { BehaviorSubject, Observable } from 'rxjs';
+import { Observable } from 'rxjs';
 import { BitstreamDataService } from '../../../../core/data/bitstream-data.service';
 
 import { Bitstream } from '../../../../core/shared/bitstream.model';

src/app/core/shared/search/search-configuration.service.ts

@@ -15,7 +15,6 @@ import { getFirstSucceededRemoteData } from '../operators';
 import { hasNoValue, hasValue, isNotEmpty, isNotEmptyOperator } from '../../../shared/empty.util';
 import { createSuccessfulRemoteDataObject$ } from '../../../shared/remote-data.utils';
 import { PaginationService } from '../../pagination/pagination.service';
-import { tap } from 'rxjs/internal/operators/tap';
 
 /**
  * Service that performs all actions that have to do with the current search configuration

src/app/core/shared/search/search.service.ts

@@ -40,7 +40,6 @@ import { FacetValues } from '../../../shared/search/facet-values.model';
 import { PaginationService } from '../../pagination/pagination.service';
 import { SearchConfigurationService } from './search-configuration.service';
 import { PaginationComponentOptions } from '../../../shared/pagination/pagination-component-options.model';
-import { tap } from 'rxjs/internal/operators/tap';
 
 /**
  * Service that performs all general actions that have to do with the search page

src/app/shared/item/item-versions/item-versions.component.ts

@@ -2,7 +2,7 @@ import { Component, Input, OnInit } from '@angular/core';
 import { Item } from '../../../core/shared/item.model';
 import { Version } from '../../../core/shared/version.model';
 import { RemoteData } from '../../../core/data/remote-data';
-import { BehaviorSubject, combineLatest as observableCombineLatest, Observable } from 'rxjs';
+import { combineLatest as observableCombineLatest, Observable } from 'rxjs';
 import { VersionHistory } from '../../../core/shared/version-history.model';
 import { getAllSucceededRemoteData, getRemoteDataPayload } from '../../../core/shared/operators';
 import { map, startWith, switchMap } from 'rxjs/operators';

src/app/shared/pagination/pagination.component.ts

@@ -20,7 +20,6 @@ import { hasValue } from '../empty.util';
 import { PageInfo } from '../../core/shared/page-info.model';
 import { PaginationService } from '../../core/pagination/pagination.service';
 import { map } from 'rxjs/operators';
-import { tap } from 'rxjs/internal/operators/tap';
 
 /**
  * The default pagination controls component.

src/app/shared/search/search-filters/search-filter/search-facet-filter-options/search-facet-option/search-facet-option.component.ts

@@ -11,7 +11,6 @@ import { hasValue } from '../../../../../empty.util';
 import { currentPath } from '../../../../../utils/route.utils';
 import { getFacetValueForType } from '../../../../search.utils';
 import { PaginationService } from '../../../../../../core/pagination/pagination.service';
-import { PaginationComponentOptions } from '../../../../../pagination/pagination-component-options.model';
 
 @Component({
   selector: 'ds-search-facet-option',

src/app/shared/search/search-labels/search-label/search-label.component.ts

@@ -1,7 +1,7 @@
 import { Component, Input, OnInit } from '@angular/core';
 import { Observable } from 'rxjs';
 import { Params, Router } from '@angular/router';
-import { map, take } from 'rxjs/operators';
+import { map } from 'rxjs/operators';
 import { hasValue, isNotEmpty } from '../../../empty.util';
 import { SearchService } from '../../../../core/shared/search/search.service';
 import { currentPath } from '../../../utils/route.utils';

src/app/shared/search/search-settings/search-settings.component.ts

@@ -1,7 +1,7 @@
 import { Component, Inject, OnInit } from '@angular/core';
 import { SearchService } from '../../../core/shared/search/search.service';
 import { SortDirection, SortOptions } from '../../../core/cache/models/sort-options.model';
-import { ActivatedRoute, NavigationExtras, Router } from '@angular/router';
+import { ActivatedRoute, Router } from '@angular/router';
 import { PaginatedSearchOptions } from '../paginated-search-options.model';
 import { Observable } from 'rxjs';
 import { SearchConfigurationService } from '../../../core/shared/search/search-configuration.service';

src/app/submission/import-external/submission-import-external.component.ts

@@ -2,7 +2,7 @@ import { Component, OnDestroy, OnInit } from '@angular/core';
 import { Router } from '@angular/router';
 
 import { BehaviorSubject, combineLatest, Subscription } from 'rxjs';
-import { filter, mergeMap, take, tap } from 'rxjs/operators';
+import { filter, mergeMap, take } from 'rxjs/operators';
 import { NgbModal, NgbModalRef } from '@ng-bootstrap/ng-bootstrap';
 
 import { ExternalSourceService } from '../../core/data/external-source.service';