Junit has failure but MR still mergeable

Summary

An MR is considered mergeable altough JUNIT reports a failure.

The relevant JUNIT content is

		<testcase name="JSON_TEST_CIRCULAR#testRoundTripVariable in test_circular.ipf (51)" classname="JSON_TEST_CIRCULAR#testRoundTripVariable" time="0.014">
			<error message="..." type="FAIL"></error>
		<system-out>...</system-out>
		<system-err>...</system-err>
		</testcase>

	<testsuite package="test_circular.ipf" id="7" name="test_circular.ipf" timestamp="2019-10-25T20:48:41Z+02:00" hostname="" tests="9" failures="0" errors="1" skipped="0" disabled="0" time="0.126">

Looks like the implementation in !17039 (merged) was not correct.

I'm using latest gitlab-ee on premise.