Fix bug in source selection

7 jobs for master in 3 minutes and 32 seconds (queued for 1 second)
latest
Status Job ID Name Coverage
  Build
failed build docs #32819
gui shared-linux

00:00:19

passed build linux installer #32820
gui shared-linux

00:01:53

passed build mac installer #32821
gui shared-mac

00:02:01

passed build windows installer #32822
gui shared-win

00:03:31

 
  Test
skipped test Linux #32823
gui shared-linux
skipped test macOS #32824
gui shared-mac
skipped test Windows #32825
gui shared-win
 
Name Stage Failure
failed
build docs Build
  File "/home/gitlab-runner/builds/xDxy3ySN/0/WEISS/SoftwareRepositories/SNAPPY/scikit-surgerydavinci/.tox/docs/lib/python3.6/site-packages/shiboken2/support/signature/loader.py", line 174, in <module>
from support.signature import mapping as sbk_mapping
File "/home/gitlab-runner/builds/xDxy3ySN/0/WEISS/SoftwareRepositories/SNAPPY/scikit-surgerydavinci/.tox/docs/lib/python3.6/site-packages/shiboken2/support/signature/__init__.py", line 43, in <module>
_ = type.__signature__
AttributeError: type object 'type' has no attribute '__signature__'
ERROR: InvocationError for command /home/gitlab-runner/builds/xDxy3ySN/0/WEISS/SoftwareRepositories/SNAPPY/scikit-surgerydavinci/.tox/docs/bin/sphinx-build -M html . build (exited with code 255)
___________________________________ summary ____________________________________
ERROR: docs: commands failed
ERROR: Job failed: exit status 1