Merge pull request #11635 from cetincakiroglu/issue-11634

Fixed #11634 - Dropdown | ng-dirty issue when options are set by a set by a service call

src/app/components/dropdown/dropdown.ts

@@ -443,7 +443,7 @@ export class Dropdown implements OnInit,AfterViewInit,AfterContentInit,AfterView
         this.updateSelectedOption(this.value);
 
         this.selectedOption = this.findOption(this.value, this.optionsToDisplay);
-        if (!this.selectedOption && this.value !== null) {
+        if (!this.selectedOption && ObjectUtils.isNotEmpty(this.value)) {
             this.value = null;
             this.onModelChange(this.value);
         }