Hammerhead throw an error, when "xhr.onreadystatechange" property is broken.

[georgiy-abbasov]

We have faced with situation, when getter and setter of property xhr.onreadystatechange are broken.
In cases without testcafe, it doesn't lead to a problem, when isn't using. But when we try to use testcafe, it tries to check this property here. It leads to problem, regardless of is used whether xhr.onreadystatechange on the original page or not.

Example, where another frameworks try to use this property

[LavrovArtem]

fixed in #1287

[lock]

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