Fix critical LUA crash in QuestLinks due to nil concatenation and invalid chat link matching

Modules/QuestLinks/ChatFilter.lua

@@ -39,8 +39,9 @@ ChatFilter.Filter = function(chatFrame, _, msg, playerName, languageName, channe
 
                     local questLink = QuestieLink:GetQuestHyperLink(questId, senderGUID)
 
-                    -- Escape the magic characters
-                    local function escapeMagic(toEsc)
+                    if questLink then
+                        -- Escape the magic characters
+                        local function escapeMagic(toEsc)
                         return (toEsc
                                 :gsub("%%", "%%%%")
                                 :gsub("^%^", "%%^")

Modules/QuestLinks/Link.lua

@@ -83,6 +83,11 @@ end
 ---@return string
 function QuestieLink:GetQuestHyperLink(questId, senderGUID)
     local coloredQuestName = QuestieLib:GetColoredQuestName(questId, Questie.db.profile.trackerShowQuestLevel, true, false)
+
+    if not coloredQuestName then
+        return nil
+    end
+
     local questLevel, _ = QuestieLib.GetTbcLevel(questId)
     local isRepeatable = QuestieDB.IsRepeatable(questId)