[datafeed] Set headers parameter to an empty dict in DataFeedParser.retrieve_url
This parameter is then passed to urllib2.Request, which expects a dict and
won't check for None.
Closes #4842333.
#!/usr/bin/make -f
export NO_SETUPTOOLS=1
%:
dh $@ --with python2
override_dh_auto_install:
dh_auto_install
# remove generated .egg-info file
rm -rf debian/*/usr/lib/python*
override_dh_python2:
dh_python2 -i /usr/share/cubicweb