117287: Prevent /api/eperson/epersons/undefined from being fired on the create ePerson page

(cherry picked from commit 0cb5b76159)

src/app/access-control/epeople-registry/eperson-form/eperson-form.component.ts

@@ -223,9 +223,11 @@ export class EPersonFormComponent implements OnInit, OnDestroy {
    * This method will initialise the page
    */
   initialisePage() {
+    if (this.route.snapshot.params.id) {
       this.subs.push(this.epersonService.findById(this.route.snapshot.params.id).subscribe((ePersonRD: RemoteData<EPerson>) => {
         this.epersonService.editEPerson(ePersonRD.payload);
       }));
+    }
     this.firstName = new DynamicInputModel({
       id: 'firstName',
       label: this.translateService.instant(`${this.messagePrefix}.firstName`),