修改一个查询user的bug

app/api/mobile/entities/user.rb

@@ -9,7 +9,7 @@ module Mobile
             u[f]
           elsif u.is_a?(::User)
             if u.respond_to?(f)
-              u.send(f)
+              u.send(f)  unless u.user_extensions.nil?
             else
               case f
                 when :img_url
@@ -17,9 +17,9 @@ module Mobile
                 when :gender
                   u.nil? || u.user_extensions.nil? || u.user_extensions.gender.nil? ? 0 : u.user_extensions.gender
                 when :work_unit
-                  get_user_work_unit u
+                  get_user_work_unit u  unless u.user_extensions.nil?
                 when :location
-                  get_user_location u
+                  get_user_location u  unless u.user_extensions.nil?
                 when :brief_introduction
                   u.nil? || u.user_extensions.nil? ? "" : u.user_extensions.brief_introduction
               end