RUNAS: diff -r72:73 wp-includes\js\autosave.dev.js
Index: wp-includes/js/autosave.dev.js
===================================================================
--- wp-includes/js/autosave.dev.js	(revision 72)
+++ wp-includes/js/autosave.dev.js	(revision 73)
@@ -256,7 +256,7 @@
 		post_data["post_name"] = jQuery('#post_name').val();
 
 	// Nothing to save or no change.
-	if ( ( post_data["post_title"].length == 0 && post_data["content"].length == 0 ) || post_data["post_title"] + post_data["content"] == autosaveLast ) {
+	if ( (!post_data["post_title"] && !post_data["content"]) || post_data["post_title"] + post_data["content"] == autosaveLast ) {
 		doAutoSave = false;
 	}