Test null value on tag in iOS sample

Author: Cheesebaron

samples/Sentry.Samples.Ios/AppDelegate.cs

@@ -30,6 +30,11 @@ public override bool FinishedLaunching(UIApplication application, NSDictionary l
             options.CacheDirectoryPath = Path.GetTempPath();
         });
 
+        SentrySdk.ConfigureScope(scope =>
+        {
+            scope.SetTag("IAmNull", null!);
+        });
+
         // create a new window instance based on the screen size
         Window = new UIWindow(UIScreen.MainScreen.Bounds);