CodeRunner suppresses display of empty columns in the results table. That's why you don't see a "Test" column with write-a-program questions nor an "Input" column when there's no standard input in any of the tests. It sounds like this behaviour is what's troubling you but I don't fully understand your situation nor the use case.
You say the Expected column is showing but not the Got column. This puzzles me. If there is output only when there's an error, why is the Expected column not blank, too?
I take it the output is being generated by your test code not from the student's code? In such cases I usually have the test print OK, and make that the Expected value.
If I'm misunderstanding the test environment and you really do need to display an empty column, you could achieve this by using the column specifiers to specify html format (%h) and have your test code print, say '<span></span>' when there were no errors. You'd probably also want to change the column header to something like 'Errors' rather than 'Got', too. But this is all sounding rather convoluted. Are you sure there's not an easier way to frame your tests?