fix(Sunstrider): correct map pins, override check, nil guards

- zoneDB: remap areaId 3431 → uiMapId 1241 (Sunstrider Isle) so quest 8335
  pins render on correct map instead of Eversong Woods (1941)
- compat/HBD: remove 1241→1941 redirect (Sunstrider pins now handled by zoneDB)
- compiler: QuerySingle override check skips empty tables (next() guard) so
  spawn data overrides don't fall through to nil base DB values
- MapIconTooltip: nil guards for minLevel/maxLevel to prevent crashes
- Map/QuestieMap: remove stale 1241→1941 redirect comment

Database/Zones/zoneDB.lua

@@ -52,8 +52,7 @@ local UiMapIdOverrides = {
     [1415] = 668, -- Eastern Kingdoms (matches Undercity on Ascension)
     -- [1241] intentionally NOT overridden: areaId 3430 = Eversong Woods (the whole zone),
     -- and should map to uiMapId 1941 (Eversong map) for proper coordinate rendering.
-    -- Sunstrider sub-zone pins are handled via ZONE_REDIRECT in HBD.lua (visibility)
-    -- and _ResolveMapUiMapId in QuestieMap.lua (coordinate conversion).
+    -- Zone 1241 pins render on map 1241 only (separate coordinate space from Eversong).
     [1238] = 668,  -- Northshire Valley child map (Conquest of Azeroth)
     -- [946] = 668 removed: both Sunstrider Isle AND Northshire Valley use 946 as ghost/zone map,
     -- so 946 cannot be overridden to a single zone. Instead, uiMapIdToAreaIdCache handles both.
@@ -78,8 +77,10 @@ areaIdToUiMapId[668] = 1238
 -- Pins for zone 1241 render on map 1241 (Sunstrider) using Ascension-calibrated bounds.
 ZoneDB.private.areaIdToUiMapId[3430] = 1941
 areaIdToUiMapId[3430] = 1941
-ZoneDB.private.areaIdToUiMapId[3431] = 1941
-areaIdToUiMapId[3431] = 1941
+-- Sunstrider Isle (3431) uses its own map (1241) with calibrated bounds.
+-- Pins for Sunstrider NPCs (zone 1241 coords) must appear on map 1241, not 1941.
+ZoneDB.private.areaIdToUiMapId[3431] = 1241
+areaIdToUiMapId[3431] = 1241
 -- Allow drawing pins directly on Sunstrider Isle (uiMapId 1241) via areaId 1241.
 ZoneDB.private.areaIdToUiMapId[1241] = 1241
 areaIdToUiMapId[1241] = 1241

Database/compiler.lua

@@ -1439,10 +1439,16 @@ function QuestieDBCompiler:GetDBHandle(data, pointers, skipMap, keyToRootIndex,
         ---@param key string
         ---@return any
         handle.QuerySingle = function(id, key)
-            local override = overrides[id]
-            if override then
+            -- Check override first for custom server data
+            if overrides and overrides[id] then
                 local kti = keyToRootIndex[key]
-                if kti and override[kti] ~= nil then return override[kti] end
+                if kti then
+                    local overrideVal = overrides[id][kti]
+                    -- Only use override if it has actual data (not nil, not empty table)
+                    if overrideVal ~= nil and not (type(overrideVal) == "table" and next(overrideVal) == nil) then
+                        return overrideVal
+                    end
+                end
             end
             local ptr = pointers[id]
             if not ptr then