Don't send guild messages when not in a guild

[yoshimo]

IsInGuild() should be checked before sending messages to guild.
If you aren't in a guild sending messages to the guild messages will result in an error message printed to chat: "you aren't in a guild". Will happen for every message send to the guild-channel.

[yoshimo]

KeyInformation.lua should be changed to:

local function InitData()
	AstralEvents:Unregister('CHALLENGE_MODE_MAPS_UPDATE', 'initData')
	C_ChatInfo.RegisterAddonMessagePrefix('AstralKeys')
	e.FindKeyStone(true, false)
	e.GetBestClear()

	if InGuild() then
		AstralComs:NewMessage('AstralKeys', 'request', 'GUILD')
	end

	if UnitLevel('player') < 120 then return end
	AstralEvents:Register('CHALLENGE_MODE_MAPS_UPDATE', Weekly, 'weeklyCheck')
end
AstralEvents:Register('CHALLENGE_MODE_MAPS_UPDATE', InitData, 'initData')