Allow badge_email_matches_email utility used within check_badge_belongs_to_recipient base BadgeCheck check to possibly throw a ValidationError as well as returning a matched e-mail, or None if no match found.
Allow badge_email_matches_email utility used within check_badge_belongs_to_recipient base BadgeCheck check to possibly throw a ValidationError as well as returning a matched e-mail, or None if no match found.

concentricsky/badgr-server,concentricsky/badgr-server