[Serusers] Bug in XLOG: ERROR on non-existant User-Agent header field

[Martin Koenig]

Hello,

the XLOG-Module prints an error if the User-Agend %ua Parameter is 
called on a request that does not contain a User-Agent header:

XLOG: xl_get_useragent: ERROR cannot parse User-Agent header

This is probably a bug, because this error is not showing up on a 
non-existant Contact-Header, nor on a non-existant To-Tag. Version is 
rel_0_9_0 cvs.

With best regards,
Martin Koenig