If you report a problem we want to be able to get back to you to find
out more information, or to update you on the status of a fix. So it
shouldn’t be possible to report a problem without providing an email
address.
This commit makes `email_address` a required field when `ticket_type` is
problem.
This requires a bit of fiddling with the tests which weren’t expecting
to have to provide an email address. So the tests now either:
- pass an email address
- check for an error when they don’t pass an email address
d2680fe885