Fixed `setQueryParamType()` so it sets the type to the string `"null"` instead of `null`.
Fixed `setQueryParamType()` so it sets the type to the string `"null"` instead of `null`.

(it seems something changed about how that value was interpreted from the template)

whitelynx/web-pgq,whitelynx/web-pgq,HydroLogic/web-pgq,HydroLogic/web-pgq