git master branch fails to build

subject says it all, https://jenkins.debian.net/job/reproducible_diffoscope_from_git/968/console has the details, in short:

dh clean --with python3 --with bash-completion --buildsystem=pybuild
   debian/rules override_dh_auto_clean
make[1]: Entering directory '/tmp/testrun'
debian/tests/control.sh
Generating the debian/tests/control file...
Traceback (most recent call last):
 [...]
UnboundLocalError: local variable 'pkg' referenced before assignment
Files debian/tests/control and debian/tests/control.tmp differ

The generated control file differs from the actual one.
A sourceful upload of this package is needed.

Finally I'm wondering whether filing issues about such intermediate problems is appreciate/useful, or not?