Created attachment 946685 [details]
js error when assign a invalid username to the case run

Description of problem:
as summary.

Version-Release number of selected component (if applicable):
v3.8.11-2 on devel server.

How reproducible:
100%

Steps to Reproduce:
1.open a test run and assign a non-existed name for the case run.
2.click ok in the prompt.Check the result in the console at the same time.


Actual results:
step 1.there would be a prompt "Nothing found in database"
step 2.there are js error in the console when closing the prompt.

Expected results:
js should not happen in the console when the assignee is invalid.

Additional info: