[1.7] problem with syncing TE

hey,

I need to sync TE on client and server side because changes only occur on server side.

I use getDescriptionPacket() and onDataPacket().

The problem is that TE implements ISidedInventory and I cannot sync the stacks from ItemStack[] if the stack is null, but that is necessary.

If I clear the inventory on server side the client doesn't care.

@Override
public void readFromNBT(NBTTagCompound tag) {
	super.readFromNBT(tag);
	NBTTagList invList = tag.getTagList("Inventory",
			Constants.NBT.TAG_COMPOUND);
	for (int i = 0; i < invList.tagCount(); i++) {
		NBTTagCompound stackTag = invList.getCompoundTagAt(i);
		int slot = stackTag.getByte("Slot");

		if (slot >= 0 && slot < inv.length)
			inv[slot] = ItemStack.loadItemStackFromNBT(stackTag);
	}
	active = tag.getBoolean("active");
	processing = tag.getBoolean("processing");
	cooldown = tag.getInteger("cooldown");
	name = tag.getString("name");

	NBTTagCompound st = (NBTTagCompound) tag.getTag("stack");
	stack = ItemStack.loadItemStackFromNBT(st);
}

@Override
public void writeToNBT(NBTTagCompound tag) {
	super.writeToNBT(tag);
	NBTTagList invList = new NBTTagList();
	for (int i = 0; i < inv.length; i++) {
		if (inv[i] != null) {
			NBTTagCompound stackTag = new NBTTagCompound();
			stackTag.setByte("Slot", (byte) i);
			inv[i].writeToNBT(stackTag);
			invList.appendTag(stackTag);
		}
	}
	tag.setBoolean("active", active);
	tag.setBoolean("processing", processing);
	tag.setInteger("cooldown", cooldown);
	if (name != null && !name.equals(""))
		tag.setString("name", name);

	NBTTagCompound st = new NBTTagCompound();
	if (stack != null)
		stack.writeToNBT(st);

	tag.setTag("stack", st);
	tag.setTag("Inventory", invList);

}

@Override
public Packet getDescriptionPacket() {
	NBTTagCompound syncData = new NBTTagCompound();
	this.writeToNBT(syncData);
	return new S35PacketUpdateTileEntity(this.xCoord, this.yCoord,
			this.zCoord, 1, syncData);
}

@Override
public void onDataPacket(NetworkManager net, S35PacketUpdateTileEntity pkt) {
	readFromNBT(pkt.func_148857_g());
	worldObj.markBlockForUpdate(xCoord, yCoord, zCoord);
}