[rt-users] Ticket view shows an empty page

[Mario Rimann]

Hi all

We have problem with a single ticket: When opening the display view of
that particular ticket, we get just an empty page that shows nothing than
the white background.

The link seems to be ok, if we change the ID to another value, all other
tickets are shown as expected.

What I tried:
- Logged in as root so see if it's a permission problem. Resulted in the
same behaviour as outlined above.
- Tried to search for the ticket: The ticket is found and shown in the
list of found tickets. If you click the link to the ticket: the problem
occurs.
- Had a look into the database: The ticket exists and the last stuff that
happened to this ticket was an incoming mail that changed the state of the
ticket to "open".

Any hint is really appreciated!

Cheers,
Mario