res_pjsip_sdp_rtp: Fix retrieval of "ice-pwd" attribute if in session and not media stream.
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Merged revisions 422746 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/13@422747 f38db490-d61c-443f-a65b-d21fe96a405b