Yet another fix to autosave.

frontend/app/features/content/pages/content/content-page.component.ts

@@ -52,7 +52,7 @@ export class ContentPageComponent extends ResourceOwner implements CanComponentD
 
     public formContext: any;
 
-    public content: ContentDto;
+    public content?: ContentDto | null;
     public contentVersion: Version | null;
     public contentForm: EditContentForm;
     public contentFormCompare: EditContentForm | null = null;
@@ -118,9 +118,7 @@ export class ContentPageComponent extends ResourceOwner implements CanComponentD
                     const autosaved = this.autoSaveService.get(this.autoSaveKey);
 
                     if (content) {
-                        this.content = content;
-
-                        this.loadContent(this.content.dataDraft, true);
+                        this.loadContent(content.dataDraft, true);
                     }
 
                     if (autosaved && this.isOtherContent(content) && this.contentForm.hasChanges(autosaved)) {
@@ -133,6 +131,8 @@ export class ContentPageComponent extends ResourceOwner implements CanComponentD
                                 }
                             });
                     }
+
+                    this.content = content;
                 }));
 
         this.own(
@@ -237,33 +237,45 @@ export class ContentPageComponent extends ResourceOwner implements CanComponentD
     }
 
     public discardChanges() {
+        if (this.content) {
             this.contentsState.discardDraft(this.content);
         }
+    }
 
     public delete() {
+        if (this.content) {
             this.contentsState.deleteMany([this.content]).pipe(onErrorResumeNext())
                 .subscribe(() => {
                     this.back();
                 });
         }
+    }
 
     public publishChanges() {
+        const content = this.content;
+
+        if (content) {
             this.checkPendingChanges('publish your changes').pipe(
                     filter(x => !!x),
                     switchMap(_ => this.dueTimeSelector.selectDueTime(status)),
-                switchMap(d => this.contentsState.publishDraft(this.content, d)),
+                    switchMap(d => this.contentsState.publishDraft(content, d)),
                     onErrorResumeNext())
                 .subscribe();
         }
+    }
 
     public changeStatus(status: string) {
+        const content = this.content;
+
+        if (content) {
             this.checkPendingChanges('change the status').pipe(
                     filter(x => !!x),
                     switchMap(_ => this.dueTimeSelector.selectDueTime(status)),
-                switchMap(d => this.contentsState.changeStatus(this.content, status, d)),
+                    switchMap(d => this.contentsState.changeStatus(content, status, d)),
                     onErrorResumeNext())
                 .subscribe();
         }
+    }
 
     private checkPendingChanges(action: string) {
         return this.contentForm.hasChanged() ?
@@ -276,12 +288,14 @@ export class ContentPageComponent extends ResourceOwner implements CanComponentD
     }
 
     private loadVersion(version: Version | null, compare: boolean) {
-        if (!this.content || version === null || version.eq(this.content.version)) {
+        const content = this.content;
+
+        if (!content || version === null || version.eq(content.version)) {
             this.contentFormCompare = null;
             this.contentVersion = null;
-            this.loadContent(this.content.dataDraft, true);
+            this.loadContent(content ? content.dataDraft : {}, true);
         } else {
-            this.contentsState.loadVersion(this.content, version)
+            this.contentsState.loadVersion(content, version)
                 .subscribe(dto => {
                     if (compare) {
                         this.contentFormCompare = new EditContentForm(this.languages, this.schema);
@@ -289,7 +303,7 @@ export class ContentPageComponent extends ResourceOwner implements CanComponentD
                         this.contentFormCompare.load(dto.payload);
                         this.contentFormCompare.setEnabled(false);
 
-                        this.loadContent(this.content.dataDraft, false);
+                        this.loadContent(content.dataDraft, false);
                     } else {
                         this.contentFormCompare = null;