Fixed issue with poster being passed as image instead of media.
Fixed issue with poster being passed as image instead of media.

ETSI-CTI/TinySpecMCE,mplank/tinymce,kencheung/tinymce,jashua212/tinymce,support-dot-com/tinymce,leofeyer/tinymce,gencer/tinymce,henrythewasp/tinymce,fillabs/TinySpecMCE,ETSI-CTI/TinySpecMCE,sjbufton/tinymce,mplank/tinymce,1099511627776/tinymce,M4R7iNP/tinymce,FernCreek/tinymce,pmpl-5/tinymce,enfold/tinymce,MediehusetTek/tinymce,danchr/tinymce,Kindling/tinymce,fashionsun/tinymce,henrythewasp/tinymce,fillabs/TinySpecMCE,fhchina/tinymce,kencheung/tinymce,Razzwan/tinymce,nikolas/tinymce,dziemian007/tinymce,bsuh/tinymce,ikuchmin/tinymce,support-dot-com/tinymce,enfold/tinymce,1099511627776/tinymce,VioletLife/tinymce,nbcp/tinymce,rbecheras/tinymce,blakewallan/tinymce,TeamupCom/tinymce,M4R7iNP/tinymce,shilpi230/tinymce,VioletLife/tinymce,sachgits/tinymce,jtark/tinymce,pmpl-5/tinymce,FernCreek/tinymce,ice8lue/tinymce,endjin/tinymce,gabixdev/tinymce,simachewh/tinymce,fhchina/tinymce,dziemian007/tinymce,ChristophKaser/tinymce,aduth/tinymce,danielpunkass/tinymce,tinymce/tinymce,danielpunkass/tinymce,leofeyer/tinymce,bsuh/tinymce,Zimbra/tinymce,nbcp/tinymce,jashua212/tinymce,howanghk/tinymce,rbecheras/tinymce,tinymce/tinymce,ikuchmin/tinymce,rxl194/tinymce,ice8lue/tinymce,howanghk/tinymce,tinymce/tinymce,shilpi230/tinymce,danchr/tinymce,aduth/tinymce,FernCreek/tinymce,danielpunkass/tinymce,rednose-public/tinymce,gabixdev/tinymce,Kindling/tinymce,blakewallan/tinymce,MediehusetTek/tinymce,sachgits/tinymce,Razzwan/tinymce,endjin/tinymce,fashionsun/tinymce,adaptiffdesigns/tinymce,TeamupCom/tinymce,nikolas/tinymce,sjbufton/tinymce,ChristophKaser/tinymce,rxl194/tinymce,gencer/tinymce,Shopify/tinymce,simachewh/tinymce,Zimbra/tinymce,adaptiffdesigns/tinymce,jtark/tinymce,rednose-public/tinymce