-Undo operation does not work.
-ArgumentNullException error is thrown on pressing Cntrl + Z after removing volume profile overrides.

Steps to repro:
1. Create a new HDRP project
2. Project view > Right-Click > Create > Volume Profile.
3. Add Exposure Overrides > Remove it.
4. Press "Control + Z".

Actual Result:
ArgumentNullException error is thrown in the console.

Expected Result:
No error in the console.

Reproducible in:
2020.2.0a9, 2020.1.0b8, 2020.1.0a23 with Package Version 9.0.0, 8.1.0, 8.0.1.

Working Fine in:
2020.2.0a9, 2020.1.0b8, 2020.1.0a23 with Package Version 7.3.1.

Environment:
Only on Windows.

Stacktrace:
ArgumentNullException: Value cannot be null.
Parameter name: _unity_self
UnityEditor.Rendering.VolumeComponentListEditor.OnUndoRedoPerformed () (at Library/PackageCache/com.unity.render-pipelines.core@9.0.0-preview.13/Editor/Volume/VolumeComponentListEditor.cs:120)
UnityEditor.Undo.Internal_CallUndoRedoPerformed () (at <5951c2421c324f47883bd5ba8a4bf507>:0)
UnityEditor.EditorApplication:Internal_CallGlobalEventHandler()