Fix an error when creating a ticket with a submitter email that is shared by multiple users
Fix an error when creating a ticket with a submitter email that is shared by multiple users

gwasser/django-helpdesk,django-helpdesk/django-helpdesk,rossp/django-helpdesk,gwasser/django-helpdesk,rossp/django-helpdesk,django-helpdesk/django-helpdesk,django-helpdesk/django-helpdesk,rossp/django-helpdesk,rossp/django-helpdesk,gwasser/django-helpdesk,gwasser/django-helpdesk,django-helpdesk/django-helpdesk