Merge pull request #150 from HugoDaBosss/patch

Fix mob spawners when no EntityId is given

src/main/java/us/myles/ViaVersion/transformers/OutgoingTransformer.java

@@ -624,14 +624,28 @@ public class OutgoingTransformer {
             output.writeByte(action);
             if (action == 1) { // update spawner
                 try {
+                    int index = input.readerIndex();
                     DataInputStream stream = new DataInputStream(new ByteBufInputStream(input));
                     CompoundTag tag = (CompoundTag) NBTIO.readTag(stream);
+                    if(tag != null && tag.contains("EntityId")) {
                         String entity = (String) tag.get("EntityId").getValue();
                         CompoundTag spawn = new CompoundTag("SpawnData");
                         spawn.put(new StringTag("id", entity));
                         tag.put(spawn);
                         DataOutputStream out = new DataOutputStream(new ByteBufOutputStream(output));
                         NBTIO.writeTag(out, tag);
+                    }
+                    else if(tag != null) { // EntityID does not exist
+                        CompoundTag spawn = new CompoundTag("SpawnData");
+                        spawn.put(new StringTag("id", "AreaEffectCloud")); //Make spawners show up as empty when no EntityId is given.
+                        tag.put(spawn);
+                        DataOutputStream out = new DataOutputStream(new ByteBufOutputStream(output));
+                        NBTIO.writeTag(out, tag);
+                    }
+                    else { //There doesn't exist any NBT tag
+                        input.readerIndex(index);
+                        output.writeBytes(input, input.readableBytes());
+                    }
                 } catch (IOException e) {
                     e.printStackTrace();
                 }