CTweb: add check that the specified source folder exists
CTweb: add check that the specified source folder exists

cycronix/cloudturbine,jpw-erigo/cloudturbine,jpw-erigo/cloudturbine,jpw-erigo/cloudturbine,jpw-erigo/cloudturbine,cycronix/cloudturbine,cycronix/cloudturbine,cycronix/cloudturbine