Fix several bugs with fluids (null vs. EMPTY).

Fix IAEFluidStack NBT serialization.
Fix fluid export bus not exporting.
Fix fluid formation planes.
Fix fluid annihilation planes.

src/main/java/appeng/fluids/parts/FluidHandlerAdapter.java

@@ -96,7 +96,7 @@ public class FluidHandlerAdapter implements IMEInventory<IAEFluidStack>, IBaseMo
 
         // Drain the fluid from the tank
         FluidStack gathered = this.fluidHandler.drain(requestedFluidStack, mode.getFluidAction());
-        if (gathered == null) {
+        if (gathered.isEmpty()) {
             // If nothing was pulled from the tank, return null
             return null;
         }

src/main/java/appeng/fluids/parts/PartFluidExportBus.java

@@ -102,7 +102,8 @@ public class PartFluidExportBus extends PartSharedFluidBus {
         final TileEntity te = this.getConnectedTE();
         LazyOptional<IFluidHandler> fhOpt = LazyOptional.empty();
         if (te != null) {
-            te.getCapability(CapabilityFluidHandler.FLUID_HANDLER_CAPABILITY, this.getSide().getFacing().getOpposite());
+            fhOpt = te.getCapability(CapabilityFluidHandler.FLUID_HANDLER_CAPABILITY,
+                    this.getSide().getFacing().getOpposite());
         }
         if (fhOpt.isPresent()) {
             try {

src/main/java/appeng/fluids/parts/PartFluidFormationPlane.java

@@ -8,6 +8,7 @@ import java.util.List;
 import javax.annotation.Nonnull;
 
 import net.minecraft.block.BlockState;
+import net.minecraft.entity.Entity;
 import net.minecraft.entity.player.PlayerEntity;
 import net.minecraft.inventory.container.ContainerType;
 import net.minecraft.item.ItemStack;
@@ -17,10 +18,14 @@ import net.minecraft.util.Hand;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.util.math.Vec3d;
 import net.minecraft.world.World;
+import net.minecraft.world.server.ServerWorld;
 import net.minecraftforge.client.model.data.IModelData;
+import net.minecraftforge.common.util.FakePlayer;
+import net.minecraftforge.common.util.FakePlayerFactory;
 import net.minecraftforge.fluids.FluidAttributes;
 import net.minecraftforge.fluids.FluidStack;
 import net.minecraftforge.fluids.FluidUtil;
+import net.minecraftforge.fluids.capability.IFluidHandler;
 import net.minecraftforge.fluids.capability.templates.FluidTank;
 
 import appeng.api.AEApi;
@@ -117,8 +122,11 @@ public class PartFluidFormationPlane extends PartAbstractFormationPlane<IAEFluid
                 final FluidStack fs = input.getFluidStack();
                 fs.setAmount(FluidAttributes.BUCKET_VOLUME);
 
-                final FluidTank tank = new FluidTank(FluidAttributes.BUCKET_VOLUME, e -> e.isFluidEqual(fs));
-                if (!FluidUtil.tryPlaceFluid(null, w, Hand.MAIN_HAND, pos, tank, fs)) {
+                final FluidTank tank = new FluidTank(FluidAttributes.BUCKET_VOLUME);
+                tank.fill(fs, IFluidHandler.FluidAction.EXECUTE);
+
+                FakePlayer fakePlayer = FakePlayerFactory.getMinecraft((ServerWorld) w);
+                if (!FluidUtil.tryPlaceFluid(fakePlayer, w, Hand.MAIN_HAND, pos, tank, fs)) {
                     return input;
                 }
             }