Lua error with `AdditionalInfo` config option enabled

[juemrami]

Describe the bug indexing nil type error in GroupBulletinBoard.lua:826

Introduced in #240

• see https://github.com/Vysci/LFG-Bulletin-Board/pull/240/commits/b62b5975123704af8e37ea7de11cf5105cdb3c05

To Reproduce

1. Enable the "Add more info to chat on /who and when somebody comes online" option
2. Add a random person on your friendlist to trigger the "has come online" message

Screenshots

Additional context just have to remove the req.class with class in call to GBB.Tool.GetClassIcon

txt="|Hplayer:"..name.."|h"
    ..(GBB.Tool.GetClassIcon(class) or "")
    .."|c"..GBB.Tool.ClassColor[class].colorStr .. name.."|r"
    ..symbol.."|h";

reposting from curseforge comment#664