title: Django error "The secret_key setting must not be empty" after upgrading from 1.4.3 to 1.5.1
body: <p>I just upgraded my Django from 1.4.3 to 1.5.1 using <code>pip install django --upgrade</code>. After the upgrade, my dev site started getting Internal Server Error. I tried to run <code>./manage.py</code> command but it told me "The secret_key setting must not be empty". I checked my <code>settings.py</code> file and it does have a <code>SECRET_KEY</code> value there. So I don't know what's going on there. Someone else has the same problem?</p>