When renaming a group, raise an exception if the new name is empty. Bug: Issue 1457 Change-Id: I198e1affa0c04cfcf7433eb44360c145be2d4972
When renaming a group, raise an exception if the new name is empty. Bug: Issue 1457 Change-Id: I198e1affa0c04cfcf7433eb44360c145be2d4972