fix: nil-guard GetChannelName, GetGuildRosterInfo, InterfaceOptions* on CoA client

PlayerNames.lua:94 - GetChannelName can return nil on the CoA-Beta client
when the active channel target is not joined; capture into a local and
fall back to empty string instead of chaining :lower() on nil.

PlayerNames.lua:344 - GetGuildRosterInfo(i) returns nil name/class on
this client (same family as the AltNames.lua fix in 1c4a7e8). Skip the
iteration when name is nil to avoid indexing channels.GUILD[nil] and
passing nil into AddPlayer.

Chatter.lua:204 OpenConfig and Chatter.lua:21 inline func - the Blizzard
InterfaceOptionsFrame globals are absent on CoA-Beta, so calling
IsResizable() or InterfaceOptionsFrame_OpenToCategory() throws. Guard
both call sites and fall back to opening the standalone AceConfigDialog
window.

ChatScroll.lua:53 - InterfaceOptionsSocialPanelChatMouseScroll_SetScrolling
is also missing on this client; only hook it when the global exists,
otherwise AceHook errors out at OnInitialize.

Chatter.lua

@@ -19,9 +19,14 @@ local options = {
 					name = L["Standalone Config"],
 					desc = L["Open a standalone config window. You might consider installing |cffffff00BetterBlizzOptions|r to make the Blizzard UI options panel resizable."],
 					func = function()
+						if InterfaceOptionsFrame and InterfaceOptionsFrame_OpenToCategory then
 							InterfaceOptionsFrame:Hide()
 							AceConfigDialog:SetDefaultSize("Chatter", 500, 550)
 							AceConfigDialog:Open("Chatter")
+						else
+							AceConfigDialog:SetDefaultSize("Chatter", 500, 550)
+							AceConfigDialog:Open("Chatter")
+						end
 					end
 				}
 			}
@@ -202,6 +207,7 @@ function Chatter:FCF_OpenTemporaryWindow(chatType, chatTarget, sourceChatFrame,
 end
 
 function Chatter:OpenConfig(input)
+	if InterfaceOptionsFrame and InterfaceOptionsFrame_OpenToCategory then
 		if input == "config" or not InterfaceOptionsFrame:IsResizable() then
 			options.args.defaultArgs.guiHidden = true
 			InterfaceOptionsFrame:Hide()
@@ -212,6 +218,9 @@ function Chatter:OpenConfig(input)
 			options.args.defaultArgs.guiHidden = false
 			InterfaceOptionsFrame_OpenToCategory(optFrame)
 		end
+	else
+		LibStub("AceConfigDialog-3.0"):Open("Chatter")
+	end
 end
 
 do

Modules/ChatScroll.lua

@@ -50,7 +50,9 @@ local options = {
 function mod:OnInitialize()
 	self.db = Chatter.db:RegisterNamespace(self:GetName(), defaults)
 	self:RegisterEvent("CVAR_UPDATE", "ChangedVars")
+	if _G.InterfaceOptionsSocialPanelChatMouseScroll_SetScrolling then
 		self:RawHook("InterfaceOptionsSocialPanelChatMouseScroll_SetScrolling",true)
+	end
 end
 
 function mod:InterfaceOptionsSocialPanelChatMouseScroll_SetScrolling()

Modules/PlayerNames.lua

@@ -91,7 +91,8 @@ do
 		local cf = ChatEdit_GetActiveWindow()
 		local channel = cf:GetAttribute("chatType")
 		if channel == "CHANNEL" then
-			channel = select(2, GetChannelName(cf:GetAttribute("channelTarget"))):lower()
+			local cn = select(2, GetChannelName(cf:GetAttribute("channelTarget")))
+			channel = cn and cn:lower() or ""
 		elseif channel == "OFFICER" then
 			channel = "GUILD"
 		elseif channel == "RAID_WARNING" or channel == "RAID_LEADER" or channel == "BATTLEGROUND" or channel == "BATTLEGROUND_LEADER" then
@@ -346,11 +347,13 @@ function mod:GUILD_ROSTER_UPDATE(evt)
 	wipe( channels.GUILD )
 	for i = 1, GetNumGuildMembers() do
 		local name, _, _, level, _, _, _, _, online, _, class = GetGuildRosterInfo(i)
+		if name then
 			if online then
 				channels.GUILD[name] = name
 			end
 			self:AddPlayer(name, class, level, self.db.profile.saveGuild)
 		end
+	end
 end
 
 function mod:RAID_ROSTER_UPDATE(evt)