[webconfig] fallback to default configs if https ones are not defined When cubicweb serves a request with an https scheme, it tries to access ``https_uiprops`` and ``https_datadir_urls``. However if those are not defined we should fallback to unsecure url instead of crashing with a traceback. There are very valid usecases for undefined https url. For example if your ``base_url``, ``datadir_url`` and uiprops content are already https urls. Closes #2786643

# Run all scenarii found in windmill directory
from os.path import join, dirname
from cubicweb.devtools.cwwindmill import (CubicWebWindmillUseCase,
                                          unittest_main)

class CubicWebWindmillUseCase(CubicWebWindmillUseCase):
    #test_dir = join(dirname(__file__), "windmill/test_edit_relation.py")
    pass


if __name__ == '__main__':
    unittest_main()