NullReferenceException errors are thrown on assigning HD Render Pipeline Asset to none when any Custom Pass is already assigned.

Steps to repro:
1. Create a new HDRP template project.
2. Hierarchy > Volume > Custom Pass > Add FullScreenCustomPass.
3. Edit > Project Settings > Graphics.
4. Assign HD Render Pipeline Asset > None.

Actual Result:
NullReferenceException errors in the console.

Expected Result:
No errors in the console.

Reproducible in:
2021.1.0a4, 2020.2.0b10, 2020.2.0a20 with Package version 10.1.0, 10.0.0-preview.27.

Working Fine in:
2020.2.0b5 with Package version 9.0.0-preview.71.

Environment:
Occurring on Windows 10 & mac 10.15.

Stack trace:
NullReferenceException: Object reference not set to an instance of an object
UnityEditor.Rendering.HighDefinition.DrawRenderersCustomPassDrawer.ShowMsaaObjectInfo () (at library/packagecache/com.unity.render-pipelines.high-definition@10.1.0/editor/renderpipeline/custompass/drawrendererscustompassdrawer.cs:192)
UnityEditor.Rendering.HighDefinition.DrawRenderersCustomPassDrawer.DoPassGUI (UnityEditor.SerializedProperty customPass, UnityEngine.Rect rect) (at library/packagecache/com.unity.render-pipelines.high-definition@10.1.0/editor/renderpipeline/custompass/drawrendererscustompassdrawer.cs:140)
UnityEditor.Rendering.HighDefinition.CustomPassDrawer.OnGUI (UnityEngine.Rect rect, UnityEditor.SerializedProperty property, UnityEngine.GUIContent label) (at library/packagecache/com.unity.render-pipelines.high-definition@10.1.0/editor/renderpipeline/custompass/custompassdrawer.cs:142)
UnityEditor.Rendering.HighDefinition.CustomPassVolumeEditor+<>c__DisplayClass18_0.<CreateReorderableList>b__1 (UnityEngine.Rect rect, System.Int32 index, System.Boolean active, System.Boolean focused) (at library/packagecache/com.unity.render-pipelines.high-definition@10.1.0/editor/renderpipeline/custompass/custompassvolumeeditor.cs:200)
UnityEditorInternal.ReorderableList.DoListElements (UnityEngine.Rect listRect, UnityEngine.Rect visibleRect) (at <96da5fbbe3f6429982386da09c8521a8>:0)
UnityEditorInternal.ReorderableList.DoList (UnityEngine.Rect rect, UnityEngine.Rect visibleRect) (at <96da5fbbe3f6429982386da09c8521a8>:0)
UnityEditorInternal.ReorderableList.DoList (UnityEngine.Rect rect) (at <96da5fbbe3f6429982386da09c8521a8>:0)
UnityEditor.Rendering.HighDefinition.CustomPassVolumeEditor.DrawCustomPassReorderableList () (at library/packagecache/com.unity.render-pipelines.high-definition@10.1.0/editor/renderpipeline/custompass/custompassvolumeeditor.cs:179)
UnityEditor.Rendering.HighDefinition.CustomPassVolumeEditor.OnInspectorGUI () (at library/packagecache/com.unity.render-pipelines.high-definition@10.1.0/editor/renderpipeline/custompass/custompassvolumeeditor.cs:69)
UnityEditor.UIElements.InspectorElement+<>c__DisplayClass58_0.<CreateIMGUIInspectorFromEditor>b__0 () (at <4d5a4b01276f4a4293277ed154d4fd84>:0)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr, Boolean&)