fix: Add no member placeholder in edition

src/app/profile/structure-members-management/structure-members-management.component.html

@@ -68,6 +68,9 @@
             </div>
           </div>
         </div>
+        <div *ngIf="!tempUsers.length && !structureWithOwners.owners.length">
+          Aucun membre trouvé dans cette structure.
+        </div>
       </div>
     </div>
   </div>