PJSIP: Prevent crash no-URI contacts

This prevents a crash from occurring when a contact with no URI is used
for the creation of an outbound out-of-dialog request with no
associated endpoint.
........

Merged revisions 420949 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/13@420950 f38db490-d61c-443f-a65b-d21fe96a405b
res_pjsip_send_to_voicemail.c: Fix svn file properties.
........

Merged revisions 420956 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/13@420957 f38db490-d61c-443f-a65b-d21fe96a405b