draggable destroy() error

[lideln]

When calling $('.myClass').draggable('destroy'); it crashes javascript on two cases :

• draggable() has not been called before to add drag capabilities to this object (I think it should just return quietly, not throw a JS error)
• draggable() has been called without specifying "handle". Adding "if (this.handle)" in the destroy() function fixes the bug.

[paul]

this.handle always is available if the draggable is initialized, even if you didn't pass the option - however, I added a check so it doesn't break on non-draggables. Thanks!