[VFX] Fixed two unexpected console messages

Jira: UUM-59122

1. When Unity starts a warning is displayed in the console telling two entries have the same name
2. In the VFX Graph, right click to open the context menu and select `Create Node` => exception in the console

Author: julienamsellem

Packages/com.unity.visualeffectgraph/Editor/GraphView/Views/VFXView.cs

@@ -1726,7 +1726,7 @@ public Vector2 ViewToScreenPosition(Vector2 position)
 
         void OnCreateNode(NodeCreationContext ctx)
         {
-            if (Event.current.modifiers != EventModifiers.None)
+            if (Event.current != null && Event.current.modifiers != EventModifiers.None)
             {
                 return;
             }

Packages/com.unity.visualeffectgraph/Editor/VisualEffectGraphShortcuts.cs

@@ -233,7 +233,7 @@ static void ConvertToSubgraphOperator(ShortcutArguments args)
             }
         }
 
-        [Shortcut("Visual Effect Graph/Convert to Subgraph Operators", typeof(VFXViewWindow), KeyCode.X, ShortcutModifiers.Shift)]
+        [Shortcut("Visual Effect Graph/Toggle Property<->Inline", typeof(VFXViewWindow), KeyCode.X, ShortcutModifiers.Shift)]
         static void ToggleNodePropertyOrInline(ShortcutArguments args)
         {
             if (args.context is VFXViewWindow window)