Do not try to complete users and assert when prepend is non-empty.
Review Request #124032 - Created June 6, 2015 and submitted - Latest diff uploaded
BUG: 346920 REVIEW: 124032 Add unit test for user completion when '~' is inserted.
added a unit test, it now passes. also kate and the manual kurlrequestertest_gui test don't crash anymore when I insert "~/." into a url requester.