Merge branch 'w2p-122005_fixed-dropdown-values-resetting-on-enter_con…

…tribute-7.6' into dspace-7_x

# Conflicts:
#	src/app/shared/form/builder/ds-dynamic-form-ui/models/scrollable-dropdown/dynamic-scrollable-dropdown.component.html

src/app/shared/form/builder/ds-dynamic-form-ui/models/scrollable-dropdown/dynamic-scrollable-dropdown.component.html

@@ -40,18 +40,20 @@
          (scrolled)="onScroll()"
          [scrollWindow]="false">
 
-      <button class="dropdown-item disabled" *ngIf="optionsList && optionsList.length === 0">{{'form.no-results' | translate}}</button>
+      <button class="dropdown-item disabled" type="button" *ngIf="optionsList && optionsList.length === 0">
+        {{ 'form.no-results' | translate }}
+      </button>
       <button class="dropdown-item collection-item text-truncate"
               (click)="onSelect(undefined); sdRef.close()" (mousedown)="onSelect(undefined); sdRef.close()"
               title="{{ 'dropdown.clear.tooltip' | translate }}" role="option"
-      >
+              type="button">
         <i>{{ 'dropdown.clear' | translate }}</i>
       </button>
       <button class="dropdown-item collection-item text-truncate" *ngFor="let listEntry of optionsList; let i = index"
               [class.active]="i === selectedIndex"
               (keydown.enter)="onSelect(listEntry); sdRef.close()" (mousedown)="onSelect(listEntry); sdRef.close()"
-              title="{{ listEntry.display }}" role="option"
-              [attr.id]="listEntry.display == (currentValue|async) ? ('combobox_' + id + '_selected') : null">
+              title="{{ listEntry.display }}" role="option" type="button"
+              [attr.id]="listEntry.display === (currentValue|async) ? ('combobox_' + id + '_selected') : null">
         {{inputFormatter(listEntry)}}
       </button>
       <div class="scrollable-dropdown-loading text-center" *ngIf="loading"><p>{{'form.loading' | translate}}</p></div>

src/app/shared/form/form.service.ts

@@ -130,6 +130,9 @@ export class FormService {
   }
 
   public addControlErrors(field: AbstractControl, formId: string, fieldId: string, fieldIndex: number) {
+    if (field.errors === null) {
+      return;
+    }
     const errors: string[] = Object.keys(field.errors)
       .filter((errorKey) => field.errors[errorKey] === true)
       .map((errorKey) => `error.validation.${errorKey}`);