Changed the type of Error occurring when no valid sender could be found to a FatalJobError in student_proposal_mailer. This means that the job will be immediately aborted. This patch is due to comments on r3000 by SRabbelier. Patch by: Lennard de Rijk Reviewed by: to-be-reviewed

"""Multi-consumer multi-producer dispatching mechanism

Originally based on pydispatch (BSD) http://pypi.python.org/pypi/PyDispatcher/2.0.1
See license.txt for original license.

Heavily modified for Django's purposes.
"""

from django.dispatch.dispatcher import Signal