DYN-8749 Handle crash when closing splash screen after DynamoView load (#16175)

Author: zeusongit

src/DynamoCore/Models/DynamoModel.cs

@@ -1463,7 +1463,7 @@ public void Dispose()
             }
 
             // Lucene disposals (just if LuceneNET was initialized)
-            LuceneUtility.DisposeAll();
+            LuceneUtility?.DisposeAll();
 
 #if DEBUG
             CurrentWorkspace.NodeAdded -= CrashOnDemand.CurrentWorkspace_NodeAdded;

src/DynamoCoreWpf/Views/SplashScreen/SplashScreen.xaml.cs

@@ -407,11 +407,19 @@ internal async void SetBarProperties(string version, string loadingDescription,
 
         internal async void SetLoadingDone()
         {
-            if (webView?.CoreWebView2 != null)
+            try
+            {
+                if (webView?.CoreWebView2 != null)
+                {
+                    await webView.CoreWebView2.ExecuteScriptAsync($"window.setLoadingDone()");
+                    await webView.CoreWebView2.ExecuteScriptAsync($"window.setTotalLoadingTime(\"{Wpf.Properties.Resources.SplashScreenTotalLoadingTimeLabel} {totalLoadingTime}ms\")");
+                    SetSignInEnable(enableSignInButton);
+                }
+            }
+            catch (Exception ex)
             {
-                await webView.CoreWebView2.ExecuteScriptAsync($"window.setLoadingDone()");
-                await webView.CoreWebView2.ExecuteScriptAsync($"window.setTotalLoadingTime(\"{Wpf.Properties.Resources.SplashScreenTotalLoadingTimeLabel} {totalLoadingTime}ms\")");
-                SetSignInEnable(enableSignInButton);
+                Console.WriteLine(ex.Message);
+                return;
             }
         }