Multitileentity precursor (#963)

* Refactors
* Refactor CoverableTileEntity a bit more, pull out a CommonMetaTileEntity
* Add an IDebugableTileEntity interface instead of checking various subclasses
* Move more redstone related things  to CoverableTileEntity
* Add IGTENet

* Final and dead code removal

* Address a few comments, fix a few comments, remove some more dead code, and add some more finals.

* fix bad rebase

1 files changed, 4 insertions, 2 deletions

diff --git a/src/main/java/gregtech/common/covers/GT_Cover_FacadeAE.java b/src/main/java/gregtech/common/covers/GT_Cover_FacadeAE.java
index 592b6f322d..a227d3f530 100644
--- a/src/main/java/gregtech/common/covers/GT_Cover_FacadeAE.java
+++ b/src/main/java/gregtech/common/covers/GT_Cover_FacadeAE.java
@@ -8,14 +8,16 @@ import net.minecraft.item.ItemStack;
 public class GT_Cover_FacadeAE extends GT_Cover_FacadeBase {
 	@Override
 	protected Block getTargetBlock(ItemStack aFacadeStack) {
-		Item item = aFacadeStack.getItem();
+		if(aFacadeStack == null) return null;
+		final Item item = aFacadeStack.getItem();
 		if (!(item instanceof IFacadeItem)) return null;
 		return ((IFacadeItem) item).getBlock(aFacadeStack);
 	}
 
 	@Override
 	protected int getTargetMeta(ItemStack aFacadeStack) {
-		Item item = aFacadeStack.getItem();
+		if(aFacadeStack == null) return 0;
+		final Item item = aFacadeStack.getItem();
 		if (!(item instanceof IFacadeItem)) return 0;
 		return ((IFacadeItem) item).getMeta(aFacadeStack);
 	}