Fix missing params category value

app/controllers/admin/page_parts_controller.rb

@@ -103,6 +103,8 @@ class Admin::PagePartsController < OrbitBackendController
 
   def update
     @part = PagePart.find(params[:id])
+    # Sometimes category is passed into params[:page], so this line makes sure it will also be in params[:page_part] too
+    params[:page_part][:category] ||= params[:page][:category] 
     if @part.update_attributes(params[:page_part])
       set_children_sub_menu(@part) if @part.public_r_tag && @part.public_r_tag.eql?('sub_menu')
       flash.now[:notice] = t('update.success.content')