Null-checking is missing in 'events' extraction during event handler

[stimpy77]

After switching from jQuery 1.3 to 1.4.2, on one page, page unload errors on this line in jQuery 1.4.2 because events is null:

var events = jQuery.data(this, "events"), handlers = events[ event.type ];

This line in jQuery should be ..

var events = jQuery.data(this, "events"), handlers = events ? events[ event.type ] : null;

[stimpy77]

Missed #6163. Please close. (Sorry.)