Further StorageChannel refactoring (#3152)

Updated Drives to support more than Item and Fluid cells.
Use Collections.emptyList() instead of creating empty ArrayLists.
Fixes a NPE with uninitialized ME Chests.

Fixes #3150

src/main/java/appeng/parts/misc/PartStorageBus.java

@@ -577,7 +577,7 @@ public class PartStorageBus extends PartUpgradeable implements IGridTickable, IC
 				return Collections.singletonList( out );
 			}
 		}
-		return Arrays.asList( new IMEInventoryHandler[] {} );
+		return Collections.emptyList();
 	}
 
 	@Override