CI: fix yaml-to-junit-xml script
There is the following error in the current layout_tests
job:
Traceback (most recent call last):
File "/builds/xkeyboard-config/xkeyboard-config/.gitlab-ci/yaml-to-junit-xml.py", line 38, in <module>
for testcase in yml:
TypeError: 'NoneType' object is not iterable
It might be because of an API change. I worries me that it went totally unnoticed! Is there a way to avoid this in the future?
This MR fixes this issue, and additionally report successful tests count.