Fix an error with trim on the xm handler.

git-svn-id: http://fusionpbx.googlecode.com/svn/trunk/fusionpbx@3733 e2954ef0-caed-11de-bd98-e341d93cc3cc
Prevent an error when voicemail box does not exist.

git-svn-id: http://fusionpbx.googlecode.com/svn/trunk/fusionpbx@3734 e2954ef0-caed-11de-bd98-e341d93cc3cc