Fixed IE 11 empty editor issue.
Fixed IE 11 empty editor issue.

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