Merge branch 'master' into browse-by-features

Conflicts:
	src/app/core/core.module.ts
	src/app/core/shared/operators.ts
	src/app/shared/object-grid/item-grid-element/item-grid-element.component.html
	src/app/shared/object-list/item-list-element/item-list-element.component.html
	src/app/shared/shared.module.ts

src/app/shared/object-grid/collection-grid-element/collection-grid-element.component.ts

@@ -2,8 +2,8 @@ import { Component, Inject } from '@angular/core';
 
 import { Collection } from '../../../core/shared/collection.model';
 import { renderElementsFor} from '../../object-collection/shared/dso-element-decorator';
-import { ViewMode } from '../../../+search-page/search-options.model';
 import { AbstractListableElementComponent } from '../../object-collection/shared/object-collection-element/abstract-listable-element.component';
+import { ViewMode } from '../../../core/shared/view-mode.model';
 
 @Component({
   selector: 'ds-collection-grid-element',

src/app/shared/object-grid/community-grid-element/community-grid-element.component.ts

@@ -3,7 +3,7 @@ import { Component, Input, Inject } from '@angular/core';
 import { Community } from '../../../core/shared/community.model';
 import { AbstractListableElementComponent } from '../../object-collection/shared/object-collection-element/abstract-listable-element.component';
 import { renderElementsFor} from '../../object-collection/shared/dso-element-decorator';
-import { ViewMode } from '../../../+search-page/search-options.model';
+import { ViewMode } from '../../../core/shared/view-mode.model';
 
 @Component({
   selector: 'ds-community-grid-element',

src/app/shared/object-grid/item-grid-element/item-grid-element.component.ts

@@ -3,7 +3,7 @@ import { Component, Input, Inject } from '@angular/core';
 import { Item } from '../../../core/shared/item.model';
 import { renderElementsFor} from '../../object-collection/shared/dso-element-decorator';
 import { AbstractListableElementComponent } from '../../object-collection/shared/object-collection-element/abstract-listable-element.component';
-import { ViewMode } from '../../../+search-page/search-options.model';
+import { ViewMode } from '../../../core/shared/view-mode.model';
 
 @Component({
   selector: 'ds-item-grid-element',

src/app/shared/object-grid/search-result-grid-element/collection-search-result/collection-search-result-grid-element.component.ts

@@ -3,8 +3,8 @@ import { Component } from '@angular/core';
 import { renderElementsFor} from '../../../object-collection/shared/dso-element-decorator';
 import { SearchResultGridElementComponent } from '../search-result-grid-element.component';
 import { Collection } from '../../../../core/shared/collection.model';
-import { ViewMode } from '../../../../+search-page/search-options.model';
 import { CollectionSearchResult } from '../../../object-collection/shared/collection-search-result.model';
+import { ViewMode } from '../../../../core/shared/view-mode.model';
 
 @Component({
   selector: 'ds-collection-search-result-grid-element',

src/app/shared/object-grid/search-result-grid-element/community-search-result/community-search-result-grid-element.component.ts

@@ -2,8 +2,8 @@ import { Component } from '@angular/core';
 import { Community } from '../../../../core/shared/community.model';
 import { renderElementsFor } from '../../../object-collection/shared/dso-element-decorator';
 import { SearchResultGridElementComponent } from '../search-result-grid-element.component';
-import { ViewMode } from '../../../../+search-page/search-options.model';
 import { CommunitySearchResult } from '../../../object-collection/shared/community-search-result.model';
+import { ViewMode } from '../../../../core/shared/view-mode.model';
 
 @Component({
   selector: 'ds-community-search-result-grid-element',

src/app/shared/object-grid/search-result-grid-element/item-search-result/item-search-result-grid-element.component.html

@@ -13,7 +13,7 @@
             <p *ngIf="dso.filterMetadata(['dc.contributor.author', 'dc.creator', 'dc.contributor.*']).length > 0"
                class="item-authors card-text text-muted">
                 <ds-truncatable-part [fixedHeight]="true" [id]="dso.id" [minLines]="1">
-                    <span *ngIf="dso.findMetadata('dc.date.issued').length > 0" class="item-date">{{dso.findMetadata("dc.date.issued")}}</span>
+                    <span *ngIf="hasValue(dso.findMetadata('dc.date.issued'))" class="item-date">{{dso.findMetadata("dc.date.issued")}}</span>
                     <span *ngFor="let authorMd of dso.filterMetadata(['dc.contributor.author', 'dc.creator', 'dc.contributor.*']);">,
                         <span [innerHTML]="authorMd.value"></span>
                     </span>

src/app/shared/object-grid/search-result-grid-element/item-search-result/item-search-result-grid-element.component.ts

@@ -4,8 +4,8 @@ import { renderElementsFor } from '../../../object-collection/shared/dso-element
 import { SearchResultGridElementComponent } from '../search-result-grid-element.component';
 import { Item } from '../../../../core/shared/item.model';
 import { ItemSearchResult } from '../../../object-collection/shared/item-search-result.model';
-import { ViewMode } from '../../../../+search-page/search-options.model';
 import { focusShadow } from '../../../../shared/animations/focus';
+import { ViewMode } from '../../../../core/shared/view-mode.model';
 
 @Component({
   selector: 'ds-item-search-result-grid-element',

src/app/shared/object-grid/search-result-grid-element/search-result-grid-element.component.ts

@@ -3,7 +3,7 @@ import { Component, Inject } from '@angular/core';
 import { SearchResult } from '../../../+search-page/search-result.model';
 import { DSpaceObject } from '../../../core/shared/dspace-object.model';
 import { Metadatum } from '../../../core/shared/metadatum.model';
-import { isEmpty, hasNoValue } from '../../empty.util';
+import { isEmpty, hasNoValue, hasValue } from '../../empty.util';
 import { AbstractListableElementComponent } from '../../object-collection/shared/object-collection-element/abstract-listable-element.component';
 import { ListableObject } from '../../object-collection/shared/listable-object.model';
 import { TruncatableService } from '../../truncatable/truncatable.service';
@@ -60,4 +60,5 @@ export class SearchResultGridElementComponent<T extends SearchResult<K>, K exten
   isCollapsed(): Observable<boolean> {
     return this.truncatableService.isCollapsed(this.dso.id);
   }
+
 }

src/app/shared/object-grid/wrapper-grid-element/wrapper-grid-element.component.ts

@@ -1,8 +1,8 @@
 import { Component, Injector, Input, OnInit } from '@angular/core';
-import { ViewMode } from '../../../+search-page/search-options.model';
 import { GenericConstructor } from '../../../core/shared/generic-constructor';
 import { rendersDSOType } from '../../object-collection/shared/dso-element-decorator';
 import { ListableObject } from '../../object-collection/shared/listable-object.model';
+import { ViewMode } from '../../../core/shared/view-mode.model';
 
 @Component({
   selector: 'ds-wrapper-grid-element',