Made default_role_error use logger.
Made default_role_error use logger.

This prevents raising errors for translated docs, see
https://github.com/django/djangoproject.com/issues/997

Follow up to 1cdfe8d91215eefaa18c398069dd9c6879a9511d.
elena/django,googleinterns/django,apollo13/django,auvipy/django,dsanders11/django,ghickman/django,shaib/django,rsalmaso/django,dsanders11/django,ghickman/django,felixxm/django,MarkusH/django,rsalmaso/django,freakboy3742/django,monetate/django,MarkusH/django,pauloxnet/django,django/django,adamchainz/django,shaib/django,monetate/django,blighj/django,manhhomienbienthuy/django,MarkusH/django,takis/django,felixxm/django,adamchainz/django,django/django,MarkusH/django,blighj/django,googleinterns/django,django/django,adamchainz/django,rsalmaso/django,takis/django,atul-bhouraskar/django,ghickman/django,pauloxnet/django,shaib/django,googleinterns/django,solarissmoke/django,wkschwartz/django,koordinates/django,ghickman/django,elena/django,auvipy/django,felixxm/django,solarissmoke/django,koordinates/django,adamchainz/django,googleinterns/django,wkschwartz/django,monetate/django,atul-bhouraskar/django,manhhomienbienthuy/django,felixxm/django,freakboy3742/django,solarissmoke/django,blighj/django,apollo13/django,wkschwartz/django,atul-bhouraskar/django,freakboy3742/django,pauloxnet/django,pauloxnet/django,koordinates/django,manhhomienbienthuy/django,apollo13/django,elena/django,auvipy/django,elena/django,blighj/django,monetate/django,shaib/django,auvipy/django,wkschwartz/django,atul-bhouraskar/django,django/django,dsanders11/django,apollo13/django,takis/django,solarissmoke/django,manhhomienbienthuy/django,dsanders11/django,takis/django,koordinates/django,rsalmaso/django