Fixed some coverables not dropping covers.

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

@@ -24,6 +24,7 @@ import net.minecraftforge.fluids.FluidStack;
 import net.minecraftforge.fluids.capability.IFluidHandler;
 import net.minecraftforge.items.IItemHandler;
 import net.minecraftforge.items.ItemHandlerHelper;
+import net.minecraftforge.items.wrapper.CombinedInvWrapper;
 
 public class NetworkNodeExporter extends NetworkNode implements IComparable, IType, ICoverable {
     public static final String ID = "exporter";
@@ -217,7 +218,7 @@ public class NetworkNodeExporter extends NetworkNode implements IComparable, ITy
 
     @Override
     public IItemHandler getDrops() {
-        return upgrades;
+        return new CombinedInvWrapper(upgrades, coverManager.getAsInventory());
     }
 
     @Override

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

@@ -32,6 +32,7 @@ import net.minecraftforge.common.util.Constants;
 import net.minecraftforge.fluids.FluidStack;
 import net.minecraftforge.items.IItemHandler;
 
+import javax.annotation.Nullable;
 import java.util.List;
 import java.util.concurrent.CopyOnWriteArrayList;
 
@@ -351,6 +352,12 @@ public class NetworkNodeExternalStorage extends NetworkNode implements IStorageP
         return fluidStorages;
     }
 
+    @Nullable
+    @Override
+    public IItemHandler getDrops() {
+        return coverManager.getAsInventory();
+    }
+
     @Override
     public CoverManager getCoverManager() {
         return coverManager;

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

@@ -27,6 +27,7 @@ import net.minecraftforge.fluids.Fluid;
 import net.minecraftforge.fluids.FluidStack;
 import net.minecraftforge.fluids.capability.IFluidHandler;
 import net.minecraftforge.items.IItemHandler;
+import net.minecraftforge.items.wrapper.CombinedInvWrapper;
 
 public class NetworkNodeImporter extends NetworkNode implements IComparable, IFilterable, IType, ICoverable {
     public static final String ID = "importer";
@@ -216,7 +217,7 @@ public class NetworkNodeImporter extends NetworkNode implements IComparable, IFi
 
     @Override
     public IItemHandler getDrops() {
-        return upgrades;
+        return new CombinedInvWrapper(upgrades, coverManager.getAsInventory());
     }
 
     @Override

src/main/java/com/raoulvdberge/refinedstorage/apiimpl/network/node/cover/CoverManager.java

@@ -15,7 +15,7 @@ import net.minecraft.nbt.NBTTagList;
 import net.minecraft.util.EnumBlockRenderType;
 import net.minecraft.util.EnumFacing;
 import net.minecraftforge.common.property.IExtendedBlockState;
-import net.minecraftforge.items.IItemHandler;
+import net.minecraftforge.items.IItemHandlerModifiable;
 import net.minecraftforge.items.ItemStackHandler;
 
 import javax.annotation.Nullable;
@@ -112,7 +112,7 @@ public class CoverManager {
         return list;
     }
 
-    public IItemHandler getAsInventory() {
+    public IItemHandlerModifiable getAsInventory() {
         ItemStackHandler handler = new ItemStackHandler(covers.size());
 
         int i = 0;