FIX: improves tag-list setting (#9574)

- Prevents setting to display an empty tag
- Updates dropdown when selecting/removing tag

app/assets/javascripts/select-kit/components/tag-chooser.js

@@ -66,8 +66,12 @@ export default MultiSelectComponent.extend(TagsMixin, {
   }),
 
   actions: {
-    onChange(value) {
-      this.set("tags", value);
+    onChange(value, items) {
+      if (this.attrs.onChange) {
+        this.attrs.onChange(value, items);
+      } else {
+        this.set("tags", value);
+      }
     }
   },