more fixes regarding empty titles

src-ui/src/app/app.module.ts

@@ -119,7 +119,8 @@ import { MetadataCollapseComponent } from './components/document-detail/metadata
       useClass: CsrfInterceptor,
       multi: true
     },
-    FilterPipe
+    FilterPipe,
+    DocumentTitlePipe
   ],
   bootstrap: [AppComponent]
 })

src-ui/src/app/components/app-frame/app-frame.component.html

@@ -65,7 +65,7 @@
               <svg class="sidebaricon" fill="currentColor">
                 <use xlink:href="assets/bootstrap-icons.svg#file-text"/>
               </svg>
-              {{d.title}}
+              {{d.title | documentTitle}}
             </a>
           </li>
           <li class="nav-item w-100" *ngIf="openDocuments.length > 1">

src-ui/src/app/components/dashboard/widgets/saved-view-widget/saved-view-widget.component.html

@@ -13,7 +13,7 @@
     <tbody>
       <tr *ngFor="let doc of documents" routerLink="/documents/{{doc.id}}">
         <td>{{doc.created | date}}</td>
-        <td>{{doc.title}}<app-tag [tag]="t" *ngFor="let t of doc.tags$ | async" class="ml-1"></app-tag>
+        <td>{{doc.title | documentTitle}}<app-tag [tag]="t" *ngFor="let t of doc.tags$ | async" class="ml-1"></app-tag>
       </tr>
     </tbody>
   </table>

src-ui/src/app/components/document-detail/document-detail.component.ts

@@ -6,6 +6,7 @@ import { PaperlessCorrespondent } from 'src/app/data/paperless-correspondent';
 import { PaperlessDocument } from 'src/app/data/paperless-document';
 import { PaperlessDocumentMetadata } from 'src/app/data/paperless-document-metadata';
 import { PaperlessDocumentType } from 'src/app/data/paperless-document-type';
+import { DocumentTitlePipe } from 'src/app/pipes/document-title.pipe';
 import { DocumentListViewService } from 'src/app/services/document-list-view.service';
 import { OpenDocumentsService } from 'src/app/services/open-documents.service';
 import { CorrespondentService } from 'src/app/services/rest/correspondent.service';
@@ -54,7 +55,8 @@ export class DocumentDetailComponent implements OnInit {
     private router: Router,
     private modalService: NgbModal,
     private openDocumentService: OpenDocumentsService,
-    private documentListViewService: DocumentListViewService) { }
+    private documentListViewService: DocumentListViewService,
+    private documentTitlePipe: DocumentTitlePipe) { }
 
   getContentType() {
     return this.metadata?.has_archive_version ? 'application/pdf' : this.metadata?.original_mime_type
@@ -90,7 +92,7 @@ export class DocumentDetailComponent implements OnInit {
     this.documentsService.getMetadata(doc.id).subscribe(result => {
       this.metadata = result
     })
-    this.title = doc.title
+    this.title = this.documentTitlePipe.transform(doc.title)
     this.documentForm.patchValue(doc)
   }
 

src-ui/src/app/pipes/document-title.pipe.ts

@@ -5,7 +5,7 @@ import { Pipe, PipeTransform } from '@angular/core';
 })
 export class DocumentTitlePipe implements PipeTransform {
 
-  transform(value: string): unknown {
+  transform(value: string): string {
     if (value) {
       return value
     } else {