$parsed_url['query'] doesn't always exist

[johnjamesjacoby]

_remove_qs_args_if_not_in_url() assumes there is always an array item 'query' returned by parse_url.

Wrapping it in an empty check will suppress the notice and silently return the $query_string

[duck_]

There should also be an else branch so that all of the query args to check get removed if the URL doesn't have a query string, see 20528.diff​.

[nacin]

Yes, looks good. Could use some direct unit tests.

[duck_]

In [20669]:

Prevent a notice: don't attempt to parse the query string if it doesn't exist. Props johnjamesjacoby. Fixes #20528.