Fix compatibility with Mohist

[Mgazul]

No description provided.

[pop4959]

Why should we care about this PR? You've given no description of why this is necessary, and it seems like the hat permissions work just fine on all supported server platforms. This is something that should probably be fixed in Mohist, not Essentials.

[SSKirillSS]

This simple null-check makes hats working with mods (hybrid-type servers), cuz rn it just throws an exception and doesn't work at all

[pop4959]

This simple null-check makes hats working with mods (hybrid-type servers), cuz rn it just throws an exception and doesn't work at all

Yes, but clearly this is a bug with the hybrid server so a proper fix should be implemented there, so that instead of every plugin fixing this error, it's fixed server side. CraftBukkit / Spigot / Paper do not seem to have this issue.

[SSKirillSS]

Is support almost all forge-platforms via 1 additional line of code - big trouble? 🤔

Also result of test this PR (sorry about encoding):

[pop4959]

Is support almost all forge-platforms via 1 additional line of code - big trouble? 🤔

That's completely beside my point. The thing is that there should not be a precedent set for random server forks breaking plugins, and then expecting said plugins to clean up after them.

This fix needs to be made in Mohist. I'm closing this issue until further notice.

[JRoy]

Agree with pop here. You're implementing the Bukkit API wrong.

Essentials runs on Bukkit servers, if it doesn't: there's a problem with your implementation.

[mdcfe]

Mohist's support for modded items creates duplicated Material entries, when in Java enum constants should be unique. As pointed out repeatedly to Mohist users and developers, this is a Mohist bug, and we will not be including a workaround in EssentialsX.