backspace re-adds removed selected people to list, also handles infinite loading spinner

Author: vogtn

src/components/mgt-people-picker/mgt-people-picker.ts

@@ -871,6 +871,7 @@ export class MgtPeoplePicker extends MgtTemplatedComponent {
       this.userInput = '';
       // remove last person in selected list
       this.selectedPeople = this.selectedPeople.splice(0, this.selectedPeople.length - 1);
+      this.loadState();
       // reset flyout position
       this.hideFlyout();
       this.showFlyout();
@@ -879,7 +880,9 @@ export class MgtPeoplePicker extends MgtTemplatedComponent {
       return;
     }
 
-    this.handleUserSearch(input);
+    if (input.value) {
+      this.handleUserSearch(input);
+    }
   }
 
   private onPersonClick(person: IDynamicPerson): void {