Use the new optional argument to endRequest in the middleware
Currently endRequest is called twice on an exception if Django
intercepts the exception and returns it's own result. By setting
optional=True we do not crash on 'assert self.in_request'.
Coverage: code coverage testing for Python
Coverage.py is a Python module that measures code coverage during test execution.
It uses the code analysis tools and tracing hooks provided in the Python standard
library to determine which lines are executable, and which have been executed.
For more information, see http://nedbatchelder.com/code/modules/coverage.html