QuestieQuestPrivates.lua: event handler now returns nil silently when
Coordinates is nil, instead of logging a visible error. Nil coordinates
are valid for server-tracked objectives (complete N quests in zone) that
have no map pin.
Add [9] triggerEnd field to all 9 complete-N-quests quests (50151, 50145,
50098, 50100, 50149, 50099, 50108, 50111, 50150). QuestieDB.GetQuest maps
rawdata[9] to triggerEnd, which appends ObjectiveData[1]={Type='event'}
satisfying PopulateQuestLogInfo when server sends one objective. No map
pins are drawn since coordinates are nil.
Also removed unnecessary all-nil [10] objectives table from quest 50111.