Respect NonNull for real

src/main/java/com/raoulvdberge/refinedstorage/apiimpl/network/node/NetworkNodeDummy.java

@@ -0,0 +1,75 @@
+package com.raoulvdberge.refinedstorage.apiimpl.network.node;
+
+import com.raoulvdberge.refinedstorage.api.network.INetwork;
+import com.raoulvdberge.refinedstorage.api.network.node.INetworkNode;
+import net.minecraft.item.ItemStack;
+import net.minecraft.nbt.NBTTagCompound;
+import net.minecraft.util.math.BlockPos;
+import net.minecraft.world.World;
+
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+
+public class NetworkNodeDummy implements INetworkNode {
+    @Override
+    public int getEnergyUsage() {
+        return 0;
+    }
+
+    @Nonnull
+    @Override
+    public ItemStack getItemStack() {
+        return ItemStack.EMPTY;
+    }
+
+    @Override
+    public void onConnected(INetwork network) {
+        // NO OP
+    }
+
+    @Override
+    public void onDisconnected(INetwork network) {
+        // NO OP
+    }
+
+    @Override
+    public boolean canUpdate() {
+        return false;
+    }
+
+    @Nullable
+    @Override
+    public INetwork getNetwork() {
+        return null;
+    }
+
+    @Override
+    public void update() {
+        // NO OP
+    }
+
+    @Override
+    public NBTTagCompound write(NBTTagCompound tag) {
+        return tag;
+    }
+
+    @Override
+    public BlockPos getPos() {
+        return BlockPos.ORIGIN;
+    }
+
+    @Override
+    public World getWorld() {
+        return null;
+    }
+
+    @Override
+    public void markDirty() {
+        // NO OP
+    }
+
+    @Override
+    public String getId() {
+        return "dummy";
+    }
+}

src/main/java/com/raoulvdberge/refinedstorage/capability/CapabilityNetworkNodeProxy.java

@@ -3,6 +3,7 @@ package com.raoulvdberge.refinedstorage.capability;
 import com.google.common.base.Preconditions;
 import com.raoulvdberge.refinedstorage.api.network.node.INetworkNode;
 import com.raoulvdberge.refinedstorage.api.network.node.INetworkNodeProxy;
+import com.raoulvdberge.refinedstorage.apiimpl.network.node.NetworkNodeDummy;
 import net.minecraft.nbt.NBTBase;
 import net.minecraft.nbt.NBTTagCompound;
 import net.minecraft.util.EnumFacing;
@@ -29,7 +30,7 @@ public class CapabilityNetworkNodeProxy {
             @Override
             @Nonnull
             public INetworkNode getNode() {
-                throw new UnsupportedOperationException("Cannot use default implementation");
+                return new NetworkNodeDummy();
             }
         });