Should fix The-Fireplace/Mechanical-Soldiers#9

[The-Fireplace]

That crash should have been impossible, because an ItemStack's item should never be null, but for some reason, it looks like that's what it was. That is the only possible null in the line of code the crash report pointed to, the stack was null checked.

[The-Fireplace]

This closes #86 .

[TehNut]

I still feel like this is not needed. Since it's crashing on an oredict recipe, then somebody is probably adding an invalid stack to the oredict.

If you look through the client log, you can actually see JEI spamming errors around line 30847 about null items in stacks.

[The-Fireplace]

Ok, good point. Perhaps rather than crashing, Guide API should also spam errors when this happens, and handle the issue somehow. Even if it means skipping the page or something, it would still be better than crashing the game.