Fix amendment detail view error

client/src/app/domain/models/motions/motion.ts

@@ -97,7 +97,9 @@ export class Motion extends BaseModel<Motion> implements MotionFormattingReprese
     }
 
     public amendment_paragraph_text(paragraphNumber: number): string | null {
-        return this.amendment_paragraphs[paragraphNumber] ?? null;
+        return this.amendment_paragraphs && this.amendment_paragraphs[paragraphNumber]
+            ? this.amendment_paragraphs[paragraphNumber]
+            : null;
     }
 
     public static readonly REQUESTABLE_FIELDS: (keyof Motion)[] = [

client/src/app/site/pages/meetings/pages/motions/pages/motion-detail/components/motion-manage-title/motion-manage-title.component.ts

@@ -51,7 +51,7 @@ export class MotionManageTitleComponent extends BaseMotionDetailChildComponent {
     }
 
     public titleCanBeChanged(): boolean {
-        if (this.motion.isStatuteAmendment() || this.motion.isParagraphBasedAmendment()) {
+        if (this.motion.isAmendment()) {
             return false;
         }
         return this.changeRecoMode === ChangeRecoMode.Original || this.changeRecoMode === ChangeRecoMode.Diff;

client/src/app/site/pages/meetings/pages/motions/view-models/view-motion.ts

@@ -324,23 +324,27 @@ export class ViewMotion extends BaseProjectableViewModel<Motion> {
         return !!(this.tags && this.tags.length > 0);
     }
 
-    public isStatuteAmendment(): boolean {
-        return !!this.statute_paragraph_id;
-    }
-
     /**
      * Determine if the motion is in its final workflow state
      */
     public isInFinalState(): boolean {
         return this.state ? this.state.isFinalState : false;
     }
 
+    public isAmendment(): boolean {
+        return this.lead_motion_id && this.lead_motion_id > 0;
+    }
+
     /**
      * It's a paragraph-based amendments if only one paragraph is to be changed,
      * specified by -array
      */
     public isParagraphBasedAmendment(): boolean {
-        return this.lead_motion_id && this.lead_motion_id > 0;
+        return this.amendment_paragraph_numbers?.length > 0;
+    }
+
+    public isStatuteAmendment(): boolean {
+        return !!this.statute_paragraph_id;
     }
 
     public override getProjectionBuildDescriptor(
@@ -369,7 +373,7 @@ export class ViewMotion extends BaseProjectableViewModel<Motion> {
     }
 
     public getProjectiondefault(): ProjectiondefaultValue {
-        if (this.isParagraphBasedAmendment()) {
+        if (this.isAmendment()) {
             return PROJECTIONDEFAULT.amendment;
         } else {
             return PROJECTIONDEFAULT.motion;