Protect get_query_var from manual input in url

When someone messes up an URL it’s typically not something to do anything about. If you look at any site’s log they receive tons of completely broken and malformed requests every day.

You only have to care about one case — that URL parses properly and input data is valid and safe.

Whenever request is outside of these conditions you just do nothing and allow it to fail as 404 error.

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