fix(DepositFormPresentational): prevent errors when trying to set missing default data

src/app/features/deposit/components/presentationals/deposit-form/deposit-form.presentational.ts

@@ -639,10 +639,10 @@ export class DepositFormPresentational extends AbstractPresentational implements
     if (isNullOrUndefined(depositForm.contributors)) {
       depositForm.contributors = {} as any;
     }
-    if (isNonEmptyArray(this.defaultData.academicStructures)) {
+    if (isNonEmptyArray(this.defaultData?.academicStructures)) {
       depositForm.contributors.academicStructures = this.defaultData.academicStructures;
     }
-    if (isNonEmptyArray(this.defaultData.groups)) {
+    if (isNonEmptyArray(this.defaultData?.groups)) {
       depositForm.contributors.groups = this.defaultData.groups;
     }
   }