/remind doesnt work in threads (NPE)

[Zabuzard]

Overview

The /remind command can not send a reminder that was set off from within a Discord-Thread. Worse, it crashes with a NPE:

Proposed action

First of all, it is important to get rid of the error.

Either, we find a way to make it work inside threads (maybe there are some sort of thread ids?), or we just actively try to detect whether it is inside a thread (e.g. the thing is null, as the error says) and respond with something like "sorry, can not remind you from within a thread".

[Tais993]

It is possible, but I've to look into specifics before I can explain.
So if anyone is interested in fixing this, either @ me or try it yourself :p

We need to get the ID from the channel (which is possible iirc)
After this, if the channel isn't found when sending the reminder, we have to manually send a request (using JDA internals; Route)

[Tais993]

With #420 (funny number) being implemented, this shouldn't be an issue anymore.
Once released and tested this can be closed

[Zabuzard]

@Tais993 Is it autofixed, or do we have to do minor adjustments in the code still?

[Tais993]

Should be auto-fixed (but gotta verify that)

[Tais993]

Unfortunately it's not auto-fixed, should've looked at that when reviewing our code.
#422 changes the type from TextChannel to MessageChannel, this fixes that issue and after merge it'll be fixed.