[Hunvre] Remove riot damage from Hunvre's cities

[BalthazarArgall]

Summary

None

Purpose of change

The nature of the apocalypse in Hunvre isn't a slow burn with riots gradually ruining the place but more sudden, silent and peaceful hence why riot damage should be eliminated.

Describe the solution

Redefine the riot_damage pp generators as empty.

Describe alternatives you've considered

Eventually add some riot damage back but it should be way subtler than vanilla DDA to take some amount of panic into account.

Testing

Spawned, no more blood everywhere.

Additional context

Thanks @dobbry-vechur

[dobbry-vechur]

(all_mods)=> (continued from above) ERROR : src/mapgen_post_process.cpp:150 [void pp_generator::check() const] pp_generator 'riot_damage' has no sub_generators
(all_mods)=> 13:33:23.534 ERROR : src/mapgen_post_process.cpp:150 [void pp_generator::check() const] pp_generator 'riot_damage_road' has no sub_generators

huh well we may need to relax that debugmsg, it's likely too strict.

workaround would be a noop entry like "sub_generators": [ { "type": "bash_damage", "attempts": 0, "chance": 0 } ], but better to just remove that error on sub_generators_.empty()

[BalthazarArgall]

What is this about sub generators?

Alright testing with empty subgenerators, hope I don't have to also fill the sub generator array with empty fields Oh okay I reread your comment, I'm also filling those then, a bit stupid yes.