Demiplane exploration map (#1251)

* dehardcode nodeTreeControl part 1

* finish

* demiplane map system setup

* link map entity with station data!

* random demiplane map generation

* redesign demiplane map node tree

* center

* map generate v2

* location generation

* modifier generation

* missing location icons

* ui polish

* data refactor

* fix line color

* ejectabling

* split demiplane component into two

* blocker attempt

* revoking

* fix frontier calculation

* dimensit

* demiplane core room spawning

* demiplane cool destruction

* Update round_end.yml

* progression works now!

* Update CP14NodeTree.cs

* Update CP14NodeTree.cs

* documentation pass

* fix abusing, some balance pass

* demiplane naming fix

* см

* location names

* delete old keys

* Update buy.yml

* Update migration.yml

* fix guidebook

* Update misc.yml

* Update misc.yml

Content.Server/_CP14/WeatherControl/CP14WeatherControllerSystem.cs

@@ -30,6 +30,9 @@ public sealed class CP14WeatherControllerSystem : EntitySystem
 
             var weatherData = PickWeatherDataByWeight(uid, weather.Entries);
 
+            if (weatherData is null)
+                continue;
+
             if (!_proto.TryIndex(weatherData.Visuals, out var weatherVisualsIndexed))
             {
                 var weatherDuration = TimeSpan.FromSeconds(weatherData.Duration.Next(_random));
@@ -45,7 +48,7 @@ public sealed class CP14WeatherControllerSystem : EntitySystem
         }
     }
 
-    private CP14WeatherData PickWeatherDataByWeight(EntityUid map, HashSet<CP14WeatherData> entries)
+    private CP14WeatherData? PickWeatherDataByWeight(EntityUid map, HashSet<CP14WeatherData> entries)
     {
         var filteredEntries = new HashSet<CP14WeatherData>(entries);
 
@@ -60,6 +63,9 @@ public sealed class CP14WeatherControllerSystem : EntitySystem
             }
         }
 
+        if (filteredEntries.Count == 0)
+            return null;
+
         var totalWeight = filteredEntries.Sum(entry => entry.Weight);
         var randomWeight = _random.NextFloat() * totalWeight;
         var currentWeight = 0f;