Send guest badges only to guests Fixes https://jira.magfest.net/browse/MAGDEV-640 by changing the guest badge confirmation email to only send to people with Guest badges who either do not have a group or whose group has a GuestGroup of type c.GUEST.
Send guest badges only to guests
Fixes https://jira.magfest.net/browse/MAGDEV-640 by changing the guest badge confirmation email to only send to people with Guest badges who either do not have a group or whose group has a GuestGroup of type c.GUEST.

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