Issue10352 removegetvariables (#10475)

* Add javascript to disable empty form fields

* add js cleanGetUrl

* use addEventListener submit

* use addEventListener

* update collectstatics

* Use FormData to remove empty fields

* optimeze ts-ignore

* update ts-ignore comment

* oneline of ts-ignore

* one line of ts-ingnore

* fix tsc errors by adding types (as per kkthxbye)

Co-authored-by: Pieter Lambrecht <[email protected]>

Author: PieterL75