Only allow submission when form is valid.
Only allow submission when form is valid.

If the `comment` field is empty, the print-servlet complains with a
nasty and long textual error message.

m-click/geoext2,m-click/geoext2,bentrm/geoext2,annarieger/geoext2,chrismayer/geoext2,geographika/geoext2,marcjansen/geoext2,chrismayer/geoext2,Sundsvallskommun/geoext2,geoext/geoext2,bentrm/geoext2,Sundsvallskommun/geoext2,annarieger/geoext2,Sundsvallskommun/geoext2,geoext/geoext2,geographika/geoext2,marcjansen/geoext2