* 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 <pieter.lambrecht@sentia.com>