v1.2.2 - Fix event.duration and don't require CC for email

Sometimes Nessus does not provide an event.end so the script wrongly used the start of Epoch time and substracted that from the start which yielded a negtive number for scan duration. Added checks to prevent that from happening and not include event.duration or event.end in those cases.

Also fix a bug where the CC was required to send an email of the generated reports.