Custom participant statuses do not print in email confirmation

This is a similar issue to CRM-15754

However, rather than custom statuses printing their ID in an email, they now just appear blank. The statuses are displayed correctly on the confirmation and thank you pages, but do not appear in the confirmation email table of profile information.

Steps to recreate:

• Create a new participant status (publicly selectable)
• Create a new event with online booking
• Add a profile to the event that allows users to set their own participant status
• Add a basic confirmation email
• Book on to the event and in the table of profile values, the participant status is blank