liquibase-core/src/main/java/liquibase/util/csv/opencsv/bean/HeaderColumnNameMappingStrategy.java
@Override
   public PropertyDescriptor findDescriptor(int col) throws IntrospectionException {
      String columnName = getColumnName(col);
      return (StringUtil.trimToNull(columnName) != null) ? findDescriptor(columnName) : null;
   }
@Override
   public PropertyDescriptor findDescriptor(int col) throws IntrospectionException {
      String columnName = getColumnName(col);
      return (StringUtil.trimToNull(columnName) != null) ? findDescriptor(columnName) : null;
   }
Gets the property descriptor for a given column position.
@param col the column to find the description for
@return - the property descriptor for the column position or null if one could not be found.
@throws IntrospectionException - thrown on error retrieving the property description.