Add selected tagName check for itemClicked

app/assets/javascripts/filtered_search/dropdown_hint.js.es6

@@ -35,6 +35,7 @@
     itemClicked(e) {
       const { selected } = e.detail;
 
+      if (selected.tagName === 'LI') {
         if (selected.hasAttribute('data-value')) {
         this.dismissDropdown();
         } else {
@@ -49,6 +50,7 @@
           this.dispatchInputEvent();
         }
       }
+    }
 
     getSelectedTextWithoutEscaping(selectedToken) {
       const lastWord = this.input.value.split(' ').last();

app/assets/javascripts/filtered_search/filtered_search_dropdown.js.es6

@@ -28,6 +28,8 @@
 
     itemClicked(e, getValueFunction) {
       const { selected } = e.detail;
+
+      if (selected.tagName === 'LI') {
         const dataValueSet = gl.DropdownUtils.setDataValueIfSelected(selected);
 
         if (!dataValueSet) {
@@ -37,6 +39,7 @@
 
         this.dismissDropdown();
       }
+    }
 
     setAsDropdown() {
       this.input.setAttribute(DATA_DROPDOWN_TRIGGER, `#${this.dropdown.id}`);