Fix Resource::hasProperty()

[komex]

It is incorrect to check property by isset(), because it may be property with null value. The better way is replace line 183 with this code:

return array_key_exists($name, $this->properties);

[rande]

Can you create a PR ?

[pokap]

For performance :

return isset($this->properties[$name]) || array_key_exists($name, $this->properties);

[komex]

@rande may be leter.

@pokap your syntax is harder to read and there is no high performance improvement.