Resetting Camera component causes the editor to throw AssertionException when Render Pipeline Asset is set to none in the Graphics Settings, refer the attached video.

Steps to repro:
1. Create a new project
2. Windows > Package Manager > High Definition RP > Install
3. Hierarchy > Create > Camera
4. Hierarchy > Camera > Inspector > reset Camera component

Actual Result:
AssertionException is thrown on resetting Camera component

Expected Result:
"Planer Reflection Probe" component is reset without any errors.

Reproducible in:
2020.2.0a14, 2020.1.b12, 2020.1.0a23 with Package Version 9.0.0, 8.1.0. 8.0.1.

Environment:
Windows 10 & macOS 10.14

Stack Trace:
AssertionException: Assertion failure. Value was Null
Expected: Value was not Null
UnityEngine.Assertions.Assert.Fail (System.String message, System.String userMessage) (at <c5608a5591d94e67ac22bdd9105f36aa>:0)
UnityEngine.Assertions.Assert.IsNotNull (UnityEngine.Object value, System.String message) (at <c5608a5591d94e67ac22bdd9105f36aa>:0)
UnityEngine.Assertions.Assert.IsNotNull[T] (T value, System.String message) (at <c5608a5591d94e67ac22bdd9105f36aa>:0)
UnityEngine.Assertions.Assert.IsNotNull[T] (T value) (at <c5608a5591d94e67ac22bdd9105f36aa>:0)
UnityEditor.Rendering.HighDefinition.HDCameraContextualMenu.ResetCamera (UnityEditor.MenuCommand menuCommand) (at library/packagecache/com.unity.render-pipelines.high-definition@9.0.0-preview.13/editor/renderpipeline/camera/hdcameraeditor.cs:100)