fixes #213 empty ks is ignored 
fixes #213 empty ks is ignored 
matsuu/mwEmbed,abaylis/mwEmbed,panda-os/mwEmbed,DBezemer/mwEmbed,bordar/mwEmbed,tanyaLibatter/mwEmbed,abaylis/mwEmbed,bordar/mwEmbed,slash851/mwEmbed,alexmilk/mwEmbed,kaltura/mwEmbed,omridevk/mwEmbed,omridevk/mwEmbed,DBezemer/mwEmbed,joanpuigsanz/mwEmbed,abaylis/mwEmbed,tanyaLibatter/mwEmbed,matsuu/mwEmbed,tanyaLibatter/mwEmbed,SVSG/mwEmbed,slash851/mwEmbed,matsuu/mwEmbed,abaylis/mwEmbed,DBezemer/mwEmbed,alexmilk/mwEmbed,SVSG/mwEmbed,FlixMaster/mwEmbed,joanpuigsanz/mwEmbed,panda-os/mwEmbed,vladm3/mwEmbed,panda-os/mwEmbed,kaltura/mwEmbed,safarijv/mwEmbed,joanpuigsanz/mwEmbed,tanyaLibatter/mwEmbed,safarijv/mwEmbed,FlixMaster/mwEmbed,vladm3/mwEmbed,joanpuigsanz/mwEmbed,SVSG/mwEmbed,vladm3/mwEmbed,kaltura/mwEmbed,slash851/mwEmbed,panda-os/mwEmbed,alexmilk/mwEmbed,safarijv/mwEmbed,bordar/mwEmbed,bordar/mwEmbed,omridevk/mwEmbed,slash851/mwEmbed,DBezemer/mwEmbed,alexmilk/mwEmbed,FlixMaster/mwEmbed,vladm3/mwEmbed,SVSG/mwEmbed,kaltura/mwEmbed,safarijv/mwEmbed,FlixMaster/mwEmbed,omridevk/mwEmbed,matsuu/mwEmbed