static String buildStartParamFrom(final byte[] lastRow) {
    if (lastRow == null) {
      return null;
    }
    return urlEncode(Bytes.toStringBinary(lastRow));
  }
Adds {@code value} to {@code encoder} under {@code paramName} when {@code value} is non-null.
hbase-server/src/main/java/org/apache/hadoop/hbase/master/http/MetaBrowser.java