DYN-9071 Dynamo - DynamoPlayer - SplashScreen Crash

This error happens when the user follow the next steps:
- open Dynamo.
- open DynamoPlayer.
- choose a script in player.
- close Dynamo and quickly (when the hourglass cursor is still shown) click Dynamo button, then get a crash and the SplashScreen stays frozen.
So as a workaround I added some code in Dynamo SplashScreen that will show a messagebox saying that SplashScreen was not initialized correctly, then after the user clicks Ok, then will close the SplashScreen, in this way, we won't get the crash and the SplashScreen will be closed.

Author: RobertGlobant20

src/DynamoCoreWpf/Properties/Resources.Designer.cs

@@ -4241,4 +4241,10 @@ To open this graph in Dynamo 3.3–3.6.x: Install the PythonNet package from the
   <data name="ToastHyperlinkPathText" xml:space="preserve">
     <value>here</value>
   </data>
-</root>
+  <data name="DynamoSplashScreen" xml:space="preserve">
+    <value>Dynamo Splash Screen</value>
+  </data>
+  <data name="DynamoSplashScreenFailed" xml:space="preserve">
+    <value>Failed to load splash content</value>
+  </data>
+</root>

src/DynamoCoreWpf/Properties/Resources.en-US.resx

@@ -4228,4 +4228,10 @@ To open this graph in Dynamo 3.3–3.6.x: Install the PythonNet package from the
   <data name="ToastHyperlinkPathText" xml:space="preserve">
     <value>here</value>
   </data>
-</root>
+  <data name="DynamoSplashScreen" xml:space="preserve">
+    <value>Dynamo Splash Screen</value>
+  </data>
+  <data name="DynamoSplashScreenFailed" xml:space="preserve">
+    <value>Failed to load splash content</value>
+  </data>
+</root>

src/DynamoCoreWpf/Properties/Resources.resx

@@ -12,6 +12,7 @@
 using Dynamo.Core;
 using Dynamo.Logging;
 using Dynamo.Models;
+using Dynamo.UI.Prompts;
 using Dynamo.Utilities;
 using Dynamo.ViewModels;
 using Dynamo.Wpf.Utilities;
@@ -132,6 +133,20 @@ public void OnRequestDynamicSplashScreen()
         /// </summary>
         public void OnRequestStaticSplashScreen()
         {
+            if (viewModel == null)
+            {
+                Dispatcher.Invoke(() =>
+                {
+                    DynamoMessageBox.Show(
+                        owner: this,
+                        messageBoxText: Wpf.Properties.Resources.DynamoSplashScreenFailed,
+                        caption: Wpf.Properties.Resources.DynamoSplashScreen,
+                        MessageBoxButton.OK,
+                        MessageBoxImage.Warning
+                        );
+                });
+                this.Close();
+            }
             StaticSplashScreenReady?.Invoke();
         }