Fixes DriveBakedModel to not crash when SLOT_STATE is null (#3545)

Uses a null object in case the TE is not available for whichever reason.

src/main/java/appeng/block/storage/BlockDrive.java

@@ -74,13 +74,8 @@ public class BlockDrive extends AEBaseTileBlock
 	public IBlockState getExtendedState( IBlockState state, IBlockAccess world, BlockPos pos )
 	{
 		TileDrive te = this.getTileEntity( world, pos );
-		if( te == null )
-		{
-			return super.getExtendedState( state, world, pos );
-		}
-
 		IExtendedBlockState extState = (IExtendedBlockState) super.getExtendedState( state, world, pos );
-		return extState.withProperty( SLOTS_STATE, DriveSlotsState.fromChestOrDrive( te ) );
+		return extState.withProperty( SLOTS_STATE, te == null ? DriveSlotsState.createEmpty( 10 ) : DriveSlotsState.fromChestOrDrive( te ) );
 	}
 
 	@Override

src/main/java/appeng/block/storage/DriveSlotsState.java

@@ -75,4 +75,14 @@ public class DriveSlotsState
 		}
 		return new DriveSlotsState( slots );
 	}
+
+	public static DriveSlotsState createEmpty( int slotCount )
+	{
+		DriveSlotState[] slots = new DriveSlotState[slotCount];
+		for( int i = 0; i < slotCount; i++ )
+		{
+			slots[i] = DriveSlotState.EMPTY;
+		}
+		return new DriveSlotsState( slots );
+	}
 }