Invite email template is spilled when an invalid email address is detected

Issue Summary

Hi, I have come across the following:

I have request invitation in a block on a specific page. The module's 'requestinvitation' page, which is returned upon email address error, spills the invite module's email template (Your friend, ........./invite/accept/--invite-code--) to an anonymous user (in fact any user). It also seems to mess with the layout of the remaining page & blocks.

Incidentally I had to enter an email address without @ (like "kdfgk") as "dsfdf@dfaf" is accepted as a valid email address!

Has anyone else noticed/reproduced this?