CommandError exception no prints message - instead always is "django.core.management.base.CommandError"

[Cezary.Wagner]

Example on useless message for makemessages.py

            if errors:
                if status != STATUS_OK:
                    raise CommandError(
                        "errors happened while running msgmerge\n%s" % errors)

This always gives:
django.core.management.base.CommandError

Should:
"errors happened while running msgmerge\n%s" % errors

[Cezary.Wagner]

Fix exception to produce message.

[Tim Graham]

It works for me:

$ python manage.py runserver a b
CommandError: Usage is runserver [optional port number, or ipaddr:port]

Can you paste your actual terminal output? Also please use formatting on code blocks; I've added some to the description, thanks.