FIX: prevents error when loading tag groups (#8983)

app/assets/javascripts/discourse/templates/components/edit-category-tags.hbs

@@ -2,12 +2,14 @@
   <label for="category-allowed-tags">{{i18n 'category.tags_allowed_tags'}}</label>
   {{tag-chooser
     id="category-allowed-tags"
-    filterPlaceholder="category.tags_placeholder"
     tags=category.allowed_tags
     everyTag=true
     excludeSynonyms=true
     unlimitedTagCount=true
     onChange=(action (mut category.allowed_tags))
+    options=(hash
+      filterPlaceholder="category.tags_placeholder"
+    )
   }}
 </section>
 
@@ -45,8 +47,10 @@
     {{tag-group-chooser
       id="category-required-tag-group"
       tagGroups=category.required_tag_groups
+      options=(hash
         maximum=1
         filterPlaceholder="category.tag_group_selector_placeholder"
+      )
     }}
   </section>
 </section>

app/assets/javascripts/select-kit/components/tag-group-chooser.js.es6

@@ -47,7 +47,7 @@ export default MultiSelectComponent.extend(TagsMixin, {
     ).then(results => {
       if (results && results.length) {
         return results.filter(r => {
-          return !this.tagGroups.includes(this.getValue(r));
+          return !makeArray(this.tagGroups).includes(this.getValue(r));
         });
       }
     });