ArgumentNullException is thrown after deleting a VFX asset if that asset is open and was created via Visual Effect component

Steps to reproduce:

1. Open the attached project
2. In the Hierarchy, right-click and create a Visual Effect object
3. Select the object 
4. In the Inspector window, click the New button under the Visual Effect component
5. Select a Firework Template and save the Visual Effect asset
6. In the Graph Editor window, check if the Profiling information is enabled
7. In the Project window, select the newly created asset
8. Delete it
9. Observe the Console window

Actual results: ArgumentNullException is thrown

Expected results: No Errors or Warnings are thrown

Reproducible with versions: 2023.3.0a15, 6000.3.13f1, 6000.4.1f1, 6000.5.0b3, 6000.6.0a2

Couldn't test with versions: 6000.0.71f1, 2023.3.0a14 (Profiling information option was not available)

Tested on (OS): macOS 26.3.1

Notes:

• The issue does not occur if the VFX asset was created via the Project window