public static String getMapParamOrEmpty(Map<String,String[]> map, 
			String param) {
		String val = getMapParam(map, param);
		return (val == null) ? "" : val;
	}
public static String getMapParamOrEmpty ( Map < String , String [ ] > map , String param ) { String val = getMapParam ( map , param ) ; return ( val == null ) ? "" : val ; }
Extract the first value in the array mapped to by field in queryMap
@param map the Map in which to search
@param param the field value desired
@return the first value in the array mapped to field in queryMap, if
present, or an empty string otherwise