Program crashes when using -h to get help

[illera88]

Program crashes when calling programArgs.parse_args(argc, argv); :

 // Print help message
  friend auto operator<<(std::ostream &stream, const ArgumentParser &parser)
      -> std::ostream & {
    stream.setf(std::ios_base::left);
    stream << "Usage: " << parser.m_parser_path << " [options] ";
    for (const auto &argument : parser.m_positional_arguments) {
      stream << argument.m_names.front() << " "; // Crashes here
    }

0x00007ff6f1872590 L"\"front() called on empty vector\""

void argsHandling(int argc, char** argv) {
    programArgs = argparse::ArgumentParser("program.exe");

    programArgs.add_description("bla bla bla lba");
    programArgs.add_epilog("bla bla bla sdasdsdasdas");

    programArgs.add_argument("--verbose")
        .help("increase output verbosity")
        .default_value(false)
        .implicit_value(true);

    programArgs.add_argument("--json-print")
        .help("print a JSON structure")
        .default_value(false)
        .implicit_value(true);

    programArgs.add_argument("--json-file")
        .help("create a JSON file")
        .default_value(std::string{ "file.json" });

    programArgs.add_argument("--something-path")
        .help("tell program for a path");

    try {
        programArgs.parse_args(argc, argv);

    }
    catch (const std::runtime_error& err) {
        std::cerr << err.what() << std::endl;
        std::cerr << programArgs;
        std::exit(1);
    }
}

[p-ranav]

Appears to be fixed by #292