-ArgumentNullException errors are thrown continuously if any other script assigned to RenderFeature from the asset selector. (Refer a video)
-RenderPassFeature object can not be deleted in ForwardRenderdata if CustomRenderPassFeature script gets deleted.

Steps to repro:
1. Open the attached project.
2. Select CustomForwardRendererData object.
3. Click on "Add Renderer Feature" tab > "Custom Render Pass Feature".
4. Delete "CustomRenderPassFeature" script in Project window.
5. Step 2 > Remove Missing RenderFeature object in the Inspector.

Actual Result:
RenderPassFeature object does not delete.

Expected Result:
RenderPassFeature object deletes on removing from the Inspector.

Reproducible in:
2020.2.0a9, 2020.1.0b8, 2019.3.0f3 with Package version 9.0.0, 8.0.1, 7.3.1, 7.2.0, 7.1.8, 7.1.7.

Environment:
Occurring on Windows 10 & Mac 10.15.

Stack trace:
ArgumentNullException: Value cannot be null.
Parameter name: componentOrGameObject
UnityEditor.PrefabUtility.GetCorrespondingConnectedObjectFromSource[TObject] (TObject componentOrGameObject) (at <5951c2421c324f47883bd5ba8a4bf507>:0)
UnityEditor.InspectorWindowUtils.DrawAddedComponentBackground (UnityEngine.Rect position, UnityEngine.Object[] targets, System.Single adjust) (at <5951c2421c324f47883bd5ba8a4bf507>:0)
UnityEditor.UIElements.InspectorElement+<>c__DisplayClass58_0.<CreateIMGUIInspectorFromEditor>b__0 () (at <5951c2421c324f47883bd5ba8a4bf507>:0)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr, Boolean&)