This fixes a minor problem with trapped chests as input or output containers.
The plugin is designed to provide special semantics when the input container is a trapped chest. Specifically, it will never pull the last item from an item slot in a trapped chest (see full plugin description for the reason for this behavior). Unfortunately, if you open the trapped chest it will emit a redstone signal that activates the dropper causing it to "drop" one of the items in the stored crafting recipe.
This release disables the default "drop" behavior of the dropper used to construct the crafting block.