TableDescriptor getTableDescriptor() {
    if (htds.size() == 1) {
      return (TableDescriptor) htds.toArray()[0];
    } else {
      LOG.error(
        "None/Multiple table descriptors found for table '" + tableName + "' regions: " + htds);
    }
    return null;
  }
Returns descriptor common to all regions. null if are none or multiple!
hbase-server/src/main/java/org/apache/hadoop/hbase/util/HbckTableInfo.java