Description of problem:
When trying to edit a field in in the Message portlet, the GUI gets grumpy if you try to delete all the content in order to replace it.

Version-Release number of selected component (if applicable):


How reproducible:
Every time.

Steps to Reproduce:
1.  Add a Message portlet to your dashboard
2.  Click the "edit" button and enter the value "foobar" in the field; save.
3.  After returning to dashboard view, click the edit button again.
4.  Attempt to backspace over the text you've entered, or Ctrl-X the whole thing.
  
Actual results:

UI is validating before you've actually submitted anything, and thus won't let you leave that field blank.  You cannot simply remove the text before putting something else in the box- this is rejected.

Expected results:

Something a bit more user-friendly.

Additional info: