I have the following situation: I have a research that can change it's recipes based on what materials are available. I'd like to have a nullcheck for when it tries to render the recipes in the book, and just skip if the key isn't available instead of crashing.

I really like the way you put it together, and I think it would be a neat config option, so that I do not need to install a separate research file for each possible situation.

The problem is in my device, closing it.