Workaround for some hacky environments that mess up things

2 people had issues where some plugin is doing some reallly insane NMS hackery
that created invalid worlds, which caused some errors...

Really don't understand what in the world they did, but putting in a dumb guard that
shouldn't even be necessary to just not send the sound effect rather than erroring.

Spigot-Server-Patches/MC-Utils.patch

@@ -3014,10 +3014,8 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
  
 +    public WorldServer world; // Paper - store ref to world this manager is for
      public WorldProvider getWorldProvider(World world) {
-+        if (this.world == null) this.world = (WorldServer) world; // Paper
          return (WorldProvider) this.providerFactory.apply(world, this);
      }
- 
 diff --git a/src/main/java/net/minecraft/server/Entity.java b/src/main/java/net/minecraft/server/Entity.java
 index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
 --- a/src/main/java/net/minecraft/server/Entity.java
@@ -4372,6 +4370,14 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
  import org.bukkit.craftbukkit.block.data.CraftBlockData;
  import org.bukkit.event.block.BlockPhysicsEvent;
  // CraftBukkit end
+@@ -0,0 +0,0 @@ public abstract class World implements GeneratorAccess, AutoCloseable {
+         this.spigotConfig = new org.spigotmc.SpigotWorldConfig( worlddata.getName() ); // Spigot
+         this.paperConfig = new com.destroystokyo.paper.PaperWorldConfig(worlddata.getName(), this.spigotConfig); // Paper
+         this.generator = gen;
++        dimensionmanager.world = (WorldServer) this; // Paper
+         this.world = new CraftWorld((WorldServer) this, gen, env);
+         this.ticksPerAnimalSpawns = this.getServer().getTicksPerAnimalSpawns(); // CraftBukkit
+         this.ticksPerMonsterSpawns = this.getServer().getTicksPerMonsterSpawns(); // CraftBukkit
 @@ -0,0 +0,0 @@ public abstract class World implements GeneratorAccess, AutoCloseable {
          return (Chunk) this.getChunkAt(i, j, ChunkStatus.FULL);
      }