Landing pull request 377. Check custom data != null(undefined), allows zero; Fixes #9285.

More Details:
 - https://github.com/jquery/jquery/pull/377
 - http://bugs.jquery.com/ticket/9285

src/event.js

@@ -345,7 +345,7 @@ jQuery.event = {
 		event.target = elem;
 
 		// Clone any incoming data and prepend the event, creating the handler arg list
-		data = data ? jQuery.makeArray( data ) : [];
+		data = data != null ? jQuery.makeArray( data ) : [];
 		data.unshift( event );
 
 		var cur = elem,

test/unit/event.js

@@ -14,6 +14,26 @@ test("null or undefined handler", function() {
 	} catch (e) {}
 });
 
+test("bind(),live(),delegate() with non-null,defined data", function() {
+
+	expect(3);
+
+	var handler = function( event, data ) {
+				equal( data, 0, "non-null, defined data (zero) is correctly passed" );
+			};
+
+	jQuery("#foo").bind("foo", handler);
+	jQuery("#foo").live("foo", handler);
+	jQuery("div").delegate("#foo", "foo", handler);
+
+	jQuery("#foo").trigger("foo", 0);
+
+	jQuery("#foo").unbind("foo", handler);
+	jQuery("#foo").die("foo", handler);
+	jQuery("div").undelegate("#foo", "foo");
+
+});
+
 test("bind(), with data", function() {
 	expect(4);
 	var handler = function(event) {