Fixed an issue where some access checks would fail due to missing arguments.
This happens when an org document is being checked for write access when trying to show the edit link on the document's show page.
"""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