private void addParam(final QueryStringEncoder encoder, final String paramName,
    final Object value) {
    if (value != null) {
      encoder.addParam(paramName, value.toString());
    }
  }
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