Add test case for django.contrib.auth not being installed.
Add test case for django.contrib.auth not being installed.

ticosax/opbeat_python,daikeren/opbeat_python,patrys/opbeat_python,tarkatronic/opbeat_python,daikeren/opbeat_python,patrys/opbeat_python,patrys/opbeat_python,beniwohli/apm-agent-python,ticosax/opbeat_python,beniwohli/apm-agent-python,beniwohli/apm-agent-python,dirtycoder/opbeat_python,daikeren/opbeat_python,tarkatronic/opbeat_python,patrys/opbeat_python,dirtycoder/opbeat_python,beniwohli/apm-agent-python,ticosax/opbeat_python,dirtycoder/opbeat_python,tarkatronic/opbeat_python