refactor(theme-shared): add a type error control to modal.component

npm/ng-packs/packages/theme-shared/src/lib/components/modal/modal.component.html

@@ -1,5 +1,5 @@
 <ng-container *ngIf="visible">
-  <div class="modal show {{ modalClass }}" tabindex="-1" role="dialog">
+  <div id="modal-container" class="modal show {{ modalClass }}" tabindex="-1" role="dialog">
     <div class="modal-backdrop" [@fade]="isModalOpen" (click)="close()"></div>
     <div
       id="abp-modal-dialog"

npm/ng-packs/packages/theme-shared/src/lib/components/modal/modal.component.ts

@@ -109,8 +109,13 @@ export class ModalComponent implements OnDestroy {
   close() {
     if (this.busy) return;
 
+    let node: HTMLDivElement;
+    if (!this.modalContent) {
+      node = document.getElementById('modal-container') as HTMLDivElement;
+    }
+
     const nodes = getFlatNodes(
-      (this.modalContent.nativeElement.querySelector('#abp-modal-body') as HTMLElement).childNodes,
+      ((node || this.modalContent.nativeElement).querySelector('#abp-modal-body') as HTMLElement).childNodes,
     );
 
     if (hasNgDirty(nodes)) {