Issue 820: Abuse form redirects to a faulty form after a submit with mis...

...sing email to send a copy to [ERRORS]

Resolves issue: http://code.google.com/p/otwarchive/issues/detail?id=820 

There was a problem when asking to be CC'd a copy of the Abuse Report and not giving an email to have that copy sent to. The model now checks to make sure that an email address is provided if asking for a copy. Form cannot be submitted/a report is not generated if faulty data is entered.