Fix crash when no asm is found. (DynamoDS#14958)

Author: sm6srw

src/NodeServices/WorkspaceEvents.cs

@@ -87,7 +87,13 @@ internal static void OnWorkspaceSettingsChanged(bool enableLegacyPolyCurveBehavi
             var handler = WorkspaceEnableLegacyPolyCurveSettingChanged;
             if (handler != null)
             {
-                handler(new WorkspacesSettingsChangedEventArgs(enableLegacyPolyCurveBehavior));
+                try
+                {
+                    handler(new WorkspacesSettingsChangedEventArgs(enableLegacyPolyCurveBehavior));
+                }
+                catch (NullReferenceException)
+                {
+                }
             }
         }
     }