Fixed #6139 -- When sending email, made sure that the "to" and "bcc" sequences have the same type before concatenating.
Fixed #6139 -- When sending email, made sure that the "to" and "bcc" sequences have the same type before concatenating.

--HG--
extra : convert_revision : svn%3Abcc190cf-cafb-0310-a4f2-bffc1f526a37/django/trunk%406953

adieu/django-nonrel,adieu/django-nonrel,adieu/django-nonrel