private static @Nullable List<PyRequirement> getExtrasRequirements(@NotNull Module module) {
    final Map<String, List<PyRequirement>> extrasRequire = PyPackageUtil.findSetupPyExtrasRequire(module);
    return extrasRequire == null ? null : ContainerUtil.flatten(extrasRequire.values());
  }
private static @Nullable List<PyRequirement> getExtrasRequirements(@NotNull Module module)