This PR adds a null pointer check to the ChatHelper::FormatQuest function to avoid a crash that occurred when trying to format a null quest. The crash occurred when the quest pointer was nullptr and the code tried to access the GetQuestId(), GetQuestLevel() and GetTitle() methods.
Changes:
Added a nullptr check to the beginning of the ChatHelper::FormatQuest function.
Return of a standard error message ("Invalid quest") if the quest is null.
Impact:
Prevents crashes when formatting null quests.
Improves bot system stability when dealing with invalid quests.
