weatherThemes top-level property Null safety

Implementation

List<ThemeWeather> get weatherThemes => [
      ThemeWeather(day, evening.colors.first),
      ThemeWeather(candleLight, evening.colors.first),
      ThemeWeather(beforeSunRise, evening.colors.first),
      ThemeWeather(evening, evening.colors.first),
      ThemeWeather(dawn, evening.colors.first),
    ];