add check for player when extendingJsListener
add check for player when extendingJsListener

TODO figure out why player is null at this time. 
FlixMaster/mwEmbed,abaylis/mwEmbed,panda-os/mwEmbed,vladm3/mwEmbed,SVSG/mwEmbed,vladm3/mwEmbed,panda-os/mwEmbed,slash851/mwEmbed,matsuu/mwEmbed,SVSG/mwEmbed,kaltura/mwEmbed,vladm3/mwEmbed,tanyaLibatter/mwEmbed,abaylis/mwEmbed,joanpuigsanz/mwEmbed,slash851/mwEmbed,abaylis/mwEmbed,joanpuigsanz/mwEmbed,slash851/mwEmbed,DBezemer/mwEmbed,safarijv/mwEmbed,kaltura/mwEmbed,vladm3/mwEmbed,FlixMaster/mwEmbed,DBezemer/mwEmbed,omridevk/mwEmbed,bordar/mwEmbed,abaylis/mwEmbed,alexmilk/mwEmbed,matsuu/mwEmbed,alexmilk/mwEmbed,tanyaLibatter/mwEmbed,alexmilk/mwEmbed,omridevk/mwEmbed,safarijv/mwEmbed,DBezemer/mwEmbed,matsuu/mwEmbed,matsuu/mwEmbed,bordar/mwEmbed,tanyaLibatter/mwEmbed,SVSG/mwEmbed,joanpuigsanz/mwEmbed,kaltura/mwEmbed,panda-os/mwEmbed,omridevk/mwEmbed,safarijv/mwEmbed,FlixMaster/mwEmbed,alexmilk/mwEmbed,SVSG/mwEmbed,kaltura/mwEmbed,safarijv/mwEmbed,tanyaLibatter/mwEmbed,DBezemer/mwEmbed,FlixMaster/mwEmbed,bordar/mwEmbed,panda-os/mwEmbed,omridevk/mwEmbed,bordar/mwEmbed,joanpuigsanz/mwEmbed,slash851/mwEmbed