disables download of complete fitsfile/hdu when no filtering params given (only ID)

            Pol    pol  = Pol.parsePol(params);

            String pixels = SingleStringParam.parseSingleStringParam(params, "PIXELS");

            // disable complete file/hdu download

            if( (id!=null) && (pos==null) && (band==null) && (time==null) && (pol==null)

                && (pixels==null))

				{

               throw new IllegalArgumentException("At least one of filtering args must be given.");

				}

            String respFormat = sodaReq_getResponseFormat(request, DEFAULT_RESPONSEFORMAT);

            LOGGER.finest("responseFormat: " + respFormat);