Added strong/em to default list of elements to remove when empty.
Added strong/em to default list of elements to remove when empty.

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