Let formatlesspaste plugin remove empty tags RT#57942

Previously, it would try to unwrap() an empty jQuery object to
remove an empty element, now it just removes an element if it's
empty.

(cherry picked from commit b0fa832)

Author: wigentics

build/changelog/entries/2014/03/10054.RT57942.bugfix

@@ -0,0 +1 @@
+The extra/formatlesspaste plugin now can remove tags that don't contain text (e.g. img)

src/plugins/extra/formatlesspaste/lib/formatlesshandler.js

@@ -43,7 +43,11 @@ define([
 	 */
 	function removeFormatting($content, toStrip) {
 		$content.find(toStrip.join(',')).each(function () {
-			$(this).contents().unwrap();
+			if ($(this).contents().length === 0) {
+				$(this).remove();
+			} else {
+				$(this).contents().unwrap();
+			}
 		});
 	}