code: @Override
  	public BufferedImage drawUnindexedTile(int tileWidth, int tileHeight,
  			long totalFeatureCount, FeatureResultSet allFeatureResults) {
  
  		BufferedImage image = null;
  
  		if (drawUnindexedTiles) {
  			// Draw a tile indicating we have no idea if there are features
  			// inside.
  			// The table is not indexed and more features exist than the max
  			// feature count set.
  			image = drawTile(tileWidth, tileHeight, "?");
  		}
  
  		return image;
  	}
docs: {@inheritDoc}