Bug fix in spine (JSB)

Bug fix in spine (JSB)
0

On jsb_spine.js line 34, if the listener parameter is null, it will cause error on line 38 this._compeleteListener(trackEntry, loopCount). It would be better to check if listener exists before calling that callback. It would be even better to add a remove listener function for spine component.

Btw the spelling for compeleteListener is wrong