Invalid expression for query path

[kowach]

This query can return false into $nodeList and than foreach loop generates warning/error:

https://github.com/Imangazaliev/DiDOM/blob/00497fa519fe17c3349d922e6db7d43103e135a6/src/DiDom/Document.php#L443-L455

Invalid selector which generates error is '[some_attribute = "some_value"]' (notice spaces)