Don't show description text on Create Category modal

app/assets/javascripts/discourse/controllers/edit_category_controller.js

@@ -99,6 +99,10 @@ Discourse.EditCategoryController = Discourse.ObjectController.extend(Discourse.M
     return I18n.t('category.delete');
   }.property(),
 
+  showDescription: function() {
+    return !this.get('isUncategorized') && this.get('id');
+  }.property('isUncategorized', 'id'),
+
   actions: {
 
     selectGeneral: function() {

app/assets/javascripts/discourse/templates/modal/edit_category.js.handlebars

@@ -33,7 +33,7 @@
           {{/if}}
         </section>
 
-        {{#unless isUncategorized}}
+        {{#if showDescription}}
           <section class='field'>
             <label>{{i18n category.description}}</label>
 
@@ -47,7 +47,7 @@
               <button class="btn btn-small" {{action showCategoryTopic}}>{{i18n category.change_in_category_topic}}</button>
             {{/if}}
           </section>
-        {{/unless}}
+        {{/if}}
 
         <section class='field'>
           <label>{{i18n category.badge_colors}}</label>