TINY-979, table: fix caption deleting itself on backspace at the right edge
TINY-979, table: fix caption deleting itself on backspace at the right edge

tinymce/tinymce,gencer/tinymce,TeamupCom/tinymce,danielpunkass/tinymce,FernCreek/tinymce,FernCreek/tinymce,tinymce/tinymce,danielpunkass/tinymce,MediehusetTek/tinymce,TeamupCom/tinymce,adaptiffdesigns/tinymce,leofeyer/tinymce,tinymce/tinymce,MediehusetTek/tinymce,FernCreek/tinymce,adaptiffdesigns/tinymce,leofeyer/tinymce,gencer/tinymce,danielpunkass/tinymce