Gun workbench crashes if there's no recipes

[slava110]

You can find crash in #315 This happens because Create Gun Recipes Datapack removes all gun workbench recipes And because there's no gun recipes currentItem field is null on GUI init and this line is causing a crash https://github.com/MrCrayfish/MrCrayfishGunMod/blob/b79204ee05020ab325ca6272ff4c407e93130602/src/main/java/com/mrcrayfish/guns/client/screen/WorkbenchScreen.java#L408 I know that this is very specific issue but would be cool to get some kind of warning or empty recipe screen without a crash