Versions

• Minecraft: 1.12.2
• Forge: 14.23.4.2747
• Vampirism: 1.4.3

Issue Description

When I try to open the Altar with an empty Hand without having a level, it does not come out.
But i clicked an any item on the Altar, i can use its interface.

Additional Information

This is kind of intentional.
I need to distinguish if you want to access the inventory or to start the ritual. So I decided that using an empty hand initiates the ritual, but holding an item opens the GUI.
You have to start the ritual with an empty hand.