fix: 修复 Guru.AdStatusPresenter.CreateMonitorInfo 报空的问题

NullReferenceException: Object reference not set to an instance of an object. Guru.AdStatusPresenter.CreateMonitorInfo
Signed-off-by: huyufei <yufei.hu@castbox.fm>

Runtime/GuruDebugger/Runtime/AdsStatus/MVP/AdStatusPresenter.Ads.cs

@@ -65,6 +65,7 @@ namespace Guru
 
         private void OnStatueChanged(AdStatusInfo info)
         {
+            if (_model == null) return;
             _model.monitorInfo = CreateMonitorInfo();
             
             if (info != null)
@@ -106,7 +107,7 @@ namespace Guru
             string msg = "";
             bool loaded = false;
             
-            if (!ADService.Instance.IsInitialized)
+            if (ADService.Instance == null || !ADService.Instance.IsInitialized)
             {
                 msg = ColoredText("AdService not initialized...", Consts.ColorRed);
                 return msg;