Error after failed merge (and corrupted po file)

[nijel]

Traceback (most recent call last):

  File "/usr/lib/python2.7/dist-packages/django/core/handlers/base.py", line 111, in get_response
    response = callback(request, *callback_args, **callback_kwargs)

  File "/var/lib/django/l10n/weblate/trans/views.py", line 619, in translate
    unit.save_backend(request)

  File "/var/lib/django/l10n/weblate/trans/models.py", line 1080, in save_backend
    (saved, pounit) = self.translation.update_unit(self, request)

  File "/var/lib/django/l10n/weblate/trans/models.py", line 889, in update_unit
    return need_save, pounit

UnboundLocalError: local variable 'pounit' referenced before assignment

[nijel]

Fixed.