Miscutils: fix for send_email error on DEV site

* For the DEV site send_email function was failing while trying to
  concatenate list and string (because the CFG_SITE_ADMIN_EMAIL
  was not a list).
Is this change necessary?  The forging and sending email functions should accept either string or a list of strings as `toaddr`. If they do not, then it's probably a bug we should fix there...