Fix hiding the preview box when it the textarea is empty.
Fix hiding the preview box when it the textarea is empty.

bobmaerten/juvia,bobmaerten/juvia,theodi/juvia,phusion/juvia,lfzawacki/juvia,lfzawacki/juvia,theodi/juvia,phusion/juvia,lfzawacki/juvia,theodi/juvia,phusion/juvia,bobmaerten/juvia