Made sure that animate callbacks get executed even when no properties are passed in. Fixes #5459.

src/fx.js

@@ -164,6 +164,10 @@ jQuery.fn.extend({
 				}
 			});
 
+			if ( jQuery.isEmptyObject( prop ) ) {
+				return optall.complete.call(this);
+			}
+
 			// For JS strict compliance
 			return true;
 		});

test/unit/fx.js

@@ -67,6 +67,18 @@ test("animate option (queue === false)", function () {
 });
 */
 
+test("animate with no properties", function() {
+	expect(1);
+	
+	var divs = jQuery("div"), count = 0;
+
+	divs.animate({}, function(){
+		count++;
+	});
+
+	equals( divs.length, count, "Make sure that callback is called for each element in the set." );
+});
+
 test("animate duration 0", function() {
 	expect(7);