ROENROLL-1966 fix for null memorandaSection

src/app/dars/audit/audit.component.html

@@ -256,8 +256,8 @@
 
       <p class="pre-wrap" [innerHTML]="audit.requirementEndnote"></p>
       <br>
-      <p>{{ audit.bottomSection.memorandaSection.label }}</p>
-      <p *ngFor="let line of audit.bottomSection.memorandaSection.memorandaLines">
+      <p>{{ audit.bottomSection.memorandaSection?.label }}</p>
+      <p *ngFor="let line of audit.bottomSection.memorandaSection?.memorandaLines">
         {{ line }}
       </p>