[bug 1116489] Tweak manage.py to be more helpful on errors
[bug 1116489] Tweak manage.py to be more helpful on errors

If you don't have your virtualenv activated, then manage.py sputters and
squawks and between muscle spasms of its right eye rants about
conspiracies involving django.forms which is unintelligible gibberish,
not helpful and not friendly to kitsune developers.

This fixes that by catching the ImportError and giving you a more
helpful hint.

anushbmx/kitsune,feer56/Kitsune2,feer56/Kitsune2,safwanrahman/kitsune,brittanystoroz/kitsune,MikkCZ/kitsune,NewPresident1/kitsune,mythmon/kitsune,mythmon/kitsune,mozilla/kitsune,mozilla/kitsune,NewPresident1/kitsune,brittanystoroz/kitsune,MikkCZ/kitsune,NewPresident1/kitsune,Osmose/kitsune,mozilla/kitsune,MikkCZ/kitsune,feer56/Kitsune2,safwanrahman/kitsune,mozilla/kitsune,mythmon/kitsune,Osmose/kitsune,feer56/Kitsune2,MikkCZ/kitsune,safwanrahman/kitsune,safwanrahman/kitsune,brittanystoroz/kitsune,Osmose/kitsune,mythmon/kitsune,anushbmx/kitsune,brittanystoroz/kitsune,anushbmx/kitsune,anushbmx/kitsune,NewPresident1/kitsune,Osmose/kitsune