Index: /FCKeditor/trunk/editor/_source/commandclasses/fck_othercommands.js
===================================================================
--- /FCKeditor/trunk/editor/_source/commandclasses/fck_othercommands.js	(revision 672)
+++ /FCKeditor/trunk/editor/_source/commandclasses/fck_othercommands.js	(revision 673)
@@ -101,5 +101,5 @@
 	// If user wants the font size cleared, we have to find
 	// where the font size tag is and go clear it (if there's one)
-	if ( !fontSize || fontSize == null || fontSize == '' )
+	if ( !fontSize )
 	{
 		var oFont = FCK.Selection.MoveToAncestorNode('FONT');