Performant fictional entities

- Fixed crash with the Performant mod when entities are present in a ponder scene

src/main/java/com/simibubi/create/content/schematics/SchematicWorld.java

@@ -1,6 +1,7 @@
 package com.simibubi.create.content.schematics;
 
 import com.simibubi.create.Create;
+import com.simibubi.create.foundation.utility.worldWrappers.WrappedChunkProvider;
 import com.simibubi.create.foundation.utility.worldWrappers.WrappedWorld;
 import net.minecraft.block.AbstractFurnaceBlock;
 import net.minecraft.block.Block;
@@ -42,7 +43,7 @@ public class SchematicWorld extends WrappedWorld implements IServerWorld {
 	}
 
 	public SchematicWorld(BlockPos anchor, World original) {
-		super(original);
+		super(original, new WrappedChunkProvider());
 		this.blocks = new HashMap<>();
 		this.tileEntities = new HashMap<>();
 		this.bounds = new MutableBoundingBox();

src/main/java/com/simibubi/create/foundation/utility/worldWrappers/WrappedChunkProvider.java

@@ -54,6 +54,9 @@ public class WrappedChunkProvider extends AbstractChunkProvider {
 
     public WrappedChunk getChunk(int x, int z) {
         long pos = ChunkPos.asLong(x, z);
+        
+        if (chunks == null)
+        	return null;
 
         WrappedChunk chunk = chunks.get(pos);