docs: public static String getFirstFreeBusLineName(BusNetwork network) {
  		if (network == null) {
  			return null;
  		}
  		int nb = network.getBusLineCount();
  		String name;
  		do {
  			++nb;
  			name = Locale.getString("NAME_TEMPLATE", Integer.toString(nb)); //$NON-NLS-1$
  		}
  		while (network.getBusLine(name) != null);
  		return name;
  	}