NullReferenceException error is thrown on deleting Renderer Feature object in CustomForwardRendererData asset after removing the object from its preset.

Note: Workaround is to first select a valid "Renderer Feature" for the item which shows "missing" and then remove the item.

Steps to repro:
1. Create a new project.
2. Windows > Package Manager > Universal RP > Install.
3. Project Window > Right Click > Create > Rendering.
4. Universal Render Pipeline > Forward Renderer > Add Renderer features.
5. Create its Preset > Delete Renderer Features.
6. Select "CustomForwardrendererData" asset.
7. Delete the missing object from Renderer Features list.

Actual Result:
NullReferenceException error is thrown in the console.

Expected Result:
No errors in the console.

Reproducible on:
2020.1.0a12, 2019.3.0b10, 2019.2.0f1, 2019.2.0b1 (with LWRP 6.7.1)

Working Fine in:
2019.2.0a14.

Tested on Package Version: 7.1.2, 7.1.1, LWRP 6.7.1

Environment:
Windows 10 & Mac 10.14.

Stack trace:
NullReferenceException: Object reference not set to an instance of an object
UnityEditor.Rendering.Universal.ScriptableRendererDataEditor.RemovePass (UnityEditorInternal.ReorderableList list) (at library/packagecache/com.unity.render-pipelines.universal@7.1.2/editor/scriptablerendererdataeditor.cs:231)
UnityEditorInternal.ReorderableList+Defaults.DrawFooter (UnityEngine.Rect rect, UnityEditorInternal.ReorderableList list) (at <b43e6d4802d64ea8bbdaa0bf64614d3b>:0)
UnityEditorInternal.ReorderableList.DoListFooter (UnityEngine.Rect footerRect) (at <b43e6d4802d64ea8bbdaa0bf64614d3b>:0)
UnityEditorInternal.ReorderableList.DoLayoutList () (at <b43e6d4802d64ea8bbdaa0bf64614d3b>:0)
UnityEditor.Rendering.Universal.ScriptableRendererDataEditor.OnInspectorGUI () (at library/packagecache/com.unity.render-pipelines.universal@7.1.2/editor/scriptablerendererdataeditor.cs:175)
UnityEditor.Rendering.Universal.ForwardRendererDataEditor.OnInspectorGUI () (at library/packagecache/com.unity.render-pipelines.universal@7.1.2/editor/forwardrendererdataeditor.cs:56)
UnityEditor.UIElements.InspectorElement+<>c__DisplayClass55_0.<CreateIMGUIInspectorFromEditor>b__0 () (at <b43e6d4802d64ea8bbdaa0bf64614d3b>:0)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)