Merge pull request #10 from schungx/patch-1

Avoid exception when object.user is nil

plugin.rb

@@ -49,8 +49,8 @@ after_initialize do
       def excerpt
         Post.excerpt(object.cooked, 70)
       end
-      def username; object.user.username; end
-      def avatar_template; object.user.avatar_template; end
+      def username; object.user && object.user.username; end
+      def avatar_template; object.user && object.user.avatar_template; end
     end
 
     # Run a data explorer query on the currently connected database.