Description of problem: This is related to bug 1025661. After a unsuccessful operation adding a tag, it happens when remove that non-exist tag. Whatever error message returned from server side there is, it should not be shown in the web page. Version-Release number of selected component (if applicable): How reproducible: Steps to Reproduce: 1. 2. 3. Actual results: internal json data {"response": "Tags does not exist in current selected plan.", "rc": 1} is show. Expected results: A user-friendly way to tell user what is happening. Additional info: