Bukkit

What steps will reproduce the problem?
1.Create an entity, don't assign it an inventory
2.Once the entity is assigned to a spawner and is working, attempt to clear its inventory
3.

What is the expected output? What do you see instead?
There should be an error message telling the user to assign the entity an inventory before using this command. Instead, the plugin outputs an error message to the console every time it attempts to spawn the entity and the entity is spawned as a zombie. This continues untill the entity is deleted from the server.

What version of the product are you using?
CustomSpawner v0.5 for 1.6.2

Do you have an error log of what happened?
i.imgur.com/BGL9EjG.png

Please provide any additional information below.