in send_all call to send_queued_message not in try-catch

[funvit]

i just got UnicodeEncodeError in django_mailer/engine.py", line 91, in send_all

fix:

try:
    result = send_queued_message(message, smtp_connection=connection, blacklist=blacklist)
except Exception, e:
    result = constants.RESULT_FAILED
    logger.error(e)