/**
- Check whether an object is valid,
- In web engine, it will return true if the object exist
- In native engine, it will return true if the JS object and the correspond native object are both valid
- @method isObjectValid
- @param {Object} obj
-
@return {Boolean} Validity of the object
*/
sys.isObjectValid = function (obj) {
if (obj) return true;
else return false;
};