Description of problem: At the moment it is not possible to set empty string ('') as test case arguments using xmlrpc TestCase.update() call. Seems to be the same bug as https://bugzilla.redhat.com/show_bug.cgi?id=902891 . Version-Release number of selected component (if applicable): 3.8.17 How reproducible: always Steps to Reproduce: 1. case._server.TestCase.update([552762], { "arguments": ""} ) 2. 3. Actual results: Returned dictionary contains 'arguments': 'this should be overwritten', Expected results: Returned dictionary contains 'arguments':'', Additional info: