If timezone= is a parameter, still a timezone parameter is added to the request

[niccokunzmann]

When I have the query parameter timezone= with an empty timezone, I cannot view the calendar.

The reason is that the timezone is added again and that leads to a 500 error.

Reproduce:

View a calendar with timezone= at the end.
See another timezone= for the local time zone is attached.

Code: configuration.js

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