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();
 			}

src/main/java/appeng/decorative/solid/BlockSkyStone.java

@@ -65,7 +65,7 @@ public class BlockSkyStone extends AEBaseBlock
 			final ItemStack is = event.getEntityPlayer().getItemStackFromSlot( EntityEquipmentSlot.MAINHAND );
 			int level = -1;
 
-			if( !is.isEmpty() && is.getItem() != Items.AIR )
+			if( !is.isEmpty() )
 			{
 				level = is.getItem().getHarvestLevel( is, "pickaxe", event.getEntityPlayer(), event.getState() );
 			}

src/main/java/appeng/entity/EntityChargedQuartz.java

@@ -119,7 +119,7 @@ public final class EntityChargedQuartz extends AEBaseEntityItem
 				if( e instanceof EntityItem && !e.isDead )
 				{
 					final ItemStack other = ( (EntityItem) e ).getEntityItem();
-					if( !other.isEmpty() && other.getCount() > 0 )
+					if( !other.isEmpty() )
 					{
 						if( Platform.itemComparisons().isEqualItem( other, new ItemStack( Items.REDSTONE ) ) )
 						{

src/main/java/appeng/items/materials/ItemMaterial.java

@@ -221,7 +221,7 @@ public final class ItemMaterial extends AEBaseItem implements IStorageComponent,
 					{
 						for( final ItemStack is : options )
 						{
-							if( !is.isEmpty() && is.getItem() != Items.AIR )
+							if( !is.isEmpty() )
 							{
 								replacement = is.copy();
 								break;

src/main/java/appeng/parts/reporting/PartPatternTerminal.java

@@ -50,7 +50,7 @@ public class PartPatternTerminal extends AbstractPartTerminal
 
 	public static final IPartModel MODELS_OFF = new PartModel( MODEL_BASE, MODEL_OFF, MODEL_STATUS_OFF );
 	public static final IPartModel MODELS_ON = new PartModel( MODEL_BASE, MODEL_ON, MODEL_STATUS_ON ) ;
-	public static final IPartModel MODELS_HAS_CHANNEL =new PartModel( MODEL_BASE, MODEL_ON, MODEL_STATUS_HAS_CHANNEL ) ;
+	public static final IPartModel MODELS_HAS_CHANNEL = new PartModel( MODEL_BASE, MODEL_ON, MODEL_STATUS_HAS_CHANNEL ) ;
 
 	private final AppEngInternalInventory crafting = new AppEngInternalInventory( this, 9 );
 	private final AppEngInternalInventory output = new AppEngInternalInventory( this, 3 );

src/main/java/appeng/tile/inventory/AppEngInternalInventory.java

@@ -52,7 +52,7 @@ public class AppEngInternalInventory implements IInventory, Iterable<ItemStack>
 	{
 		for( int x = 0; x < this.size; x++ )
 		{
-			if( this.getStackInSlot( x ) != null )
+			if( !this.getStackInSlot( x ).isEmpty() )
 			{
 				return false;
 			}
@@ -117,7 +117,7 @@ public class AppEngInternalInventory implements IInventory, Iterable<ItemStack>
 		if( this.inv[slot] == null )
 			return ItemStack.EMPTY;
 
-		else return this.inv[slot];
+		return this.inv[slot];
 	}
 
 	@Override