make validation work only, when a type is given
make validation work only, when a type is given

gdi-by/downloadclient,Intevation/downloadclient,JuergenWeichand/downloadclient,gdi-by/downloadclient,gdi-by/downloadclient,JuergenWeichand/downloadclient,JuergenWeichand/downloadclient,gdi-by/downloadclient,Intevation/downloadclient,Intevation/downloadclient,Intevation/downloadclient,JuergenWeichand/downloadclient