Bad error for tag component misuse

[Kelwan]

When declaring a tag component, I accidentally made the mistake of declaring it in a system as readonly. The error given doesn't give a good description for the problem:

bazel-out/x64_windows-fastbuild-ST-0c60ee3d0c63/bin\system_impls/generated_sources/main.ecsact.systems.hh:60:15: error: no matching member function for call to 'get'                  
                return _ctx.get<cconf::demo::Player>();                                                                                                                                
                       ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~                                                                                                                                   
external/ecsact_lang_cpp\ecsact/cpp/execution_context.hh:32:4: note: candidate template ignored: constraints not satisfied [with C = cconf::demo::Player]                              
        C get() const {                                                                                                                                                                
          ^
external/ecsact_lang_cpp\ecsact/cpp/execution_context.hh:31:12: note: because '!std::is_empty_v<cconf::demo::Player>' evaluated to false
                requires(!std::is_empty_v<C>)

Ecsact file example:

Component Player;

System DoThingWithPlayer {
    // Causes error above
    readonly Player;
}