move gtce blocking code out of generic item adaptor

fixes crash with ae2 fluid crafting

src/main/java/appeng/integration/modules/gregtech/GTCEInventoryAdaptor.java

@@ -0,0 +1,26 @@
+package appeng.integration.modules.gregtech;
+
+import appeng.util.inv.ItemSlot;
+import net.minecraft.tileentity.TileEntity;
+import net.minecraft.util.EnumFacing;
+import net.minecraftforge.items.CapabilityItemHandler;
+import net.minecraftforge.items.IItemHandler;
+
+public abstract class GTCEInventoryAdaptor implements Iterable<ItemSlot>
+{
+    public static GTCEInventoryAdaptor getAdaptor(final TileEntity te, final EnumFacing d)
+    {
+        if (te != null && te.hasCapability(CapabilityItemHandler.ITEM_HANDLER_CAPABILITY, d))
+        {
+            // Attempt getting an IItemHandler for the given side via caps
+            IItemHandler itemHandler = te.getCapability(CapabilityItemHandler.ITEM_HANDLER_CAPABILITY, d);
+            if (itemHandler != null)
+            {
+                return new GTCEItemHandler(itemHandler);
+            }
+        }
+        return null;
+    }
+
+    public abstract boolean canRemoveAllExceptCircuits();
+}

src/main/java/appeng/integration/modules/gregtech/GTCEItemHandler.java

@@ -0,0 +1,38 @@
+package appeng.integration.modules.gregtech;
+
+import appeng.util.inv.ItemSlot;
+import net.minecraft.item.Item;
+import net.minecraft.item.ItemStack;
+import net.minecraftforge.items.IItemHandler;
+
+import java.util.Iterator;
+
+public class GTCEItemHandler extends GTCEInventoryAdaptor {
+
+    final static ItemStack integratedCircuit = new ItemStack((Item.getByNameOrId("gregtech:meta_item_1")), 1, 32766); // Gregtech Community Edition Integrated Circuit
+    protected final IItemHandler itemHandler;
+
+
+    public GTCEItemHandler( IItemHandler itemHandler )
+    {
+        this.itemHandler = itemHandler;
+    }
+
+    @Override
+    public boolean canRemoveAllExceptCircuits()
+    {
+        int slots = this.itemHandler.getSlots();
+        for( int slot = 0; slot < slots; slot++ )
+        {
+            ItemStack is = this.itemHandler.getStackInSlot( slot );
+            if ( is.isEmpty() || is.isItemEqual(integratedCircuit)) continue;
+            return false;
+        }
+        return true;
+    }
+
+    @Override
+    public Iterator<ItemSlot> iterator() {
+        return null;
+    }
+}