Added a fix for bug #2140. Opera doesn't like concating null or undefined values.

diff --git a/src/event.js b/src/event.js
index 89391d5dd179d556e3af833ddfcb035f0367c1ef..3e0a885d86125cdf905e2ce50295aba2a295a2c7 100644 (file)
--- a/src/event.js
+++ b/src/event.js
@@ -207,7 +207,7 @@ jQuery.event = {
                        // Handle triggering of extra function
                        if ( extra && jQuery.isFunction( extra ) ) {
                                // call the extra function and tack the current return value on the end for possible inspection
-                               ret = extra.apply( elem, data.concat( val ) );
+                               ret = extra.apply( elem, val == null ? data : data.concat( val ) );
                                // if anything is returned, give it precedence and have it overwrite the previous value
                                if (ret !== undefined)
                                        val = ret;