Description of problem: Version-Release number of selected component (if applicable): 19.3.git.72.6bb23e1 How reproducible: Steps to Reproduce: 1. Go to distro-->trees 2. Click on 1 distro and then click one ID under distro trees 3. Select one Lab controller and input a duplicated URL to Add+ Actual results: 500 internal server error will shown. Expected results: It will show a warning message tell user can't add a duplicated URL. Additional info:
*** This bug has been marked as a duplicate of bug 1698383 ***