FreeSWITCH

Merge pull request #593 in FS/freeswitch from ~MICJERRY/freeswitchmultimedia:master to master

* commit 'acecda7596beb5dc3a4f98cb126351d9c25454fb':
  FS-8527 [mod_conference] Do not send the video of last_video_floor_holder to video_floor_holder if already related one video to it.