Zidis fix about upload chunk_check id property

https://vimeo.com/forums/api/topic:68583
error returned is :
Trying to get property of non-object in vimeo-php-lib/vimeo.php on line 481
Undefined index:  in vimeo-php-lib/vimeo.php on line 481
Trying to get property of non-object in vimeo-php-lib/vimeo.php on line 483

Zidis response is :
"The php file asks for $chunk_check->id, but the variable $chunk_check is actually an array."
	modified:   vimeo.php