More null's and cosmetic fixes.

src/main/java/appeng/container/implementations/ContainerNetworkStatus.java

@@ -119,7 +119,7 @@ public class ContainerNetworkStatus extends AEBaseContainer
 					{
 						final IGridBlock blk = machine.getGridBlock();
 						final ItemStack is = blk.getMachineRepresentation();
-						if( !is.isEmpty() && is.getItem() != Items.AIR )
+						if( !is.isEmpty() )
 						{
 							final IAEItemStack ais = AEItemStack.create( is );
 							ais.setStackSize( 1 );

src/main/java/appeng/container/slot/SlotPatternTerm.java

@@ -58,7 +58,7 @@ public class SlotPatternTerm extends SlotCraftingTerm
 	{
 		if( !this.isEnabled() )
 		{
-			if( this.getDisplayStack() != null )
+			if( !this.getDisplayStack().isEmpty() )
 			{
 				this.clearStack();
 			}