NullReferenceException errors are thrown while removing HD Additional Reflection Component.

Steps to repro:
1. Create a new HDRP Project.
2. Hierarchy > Right Click > Light > Reflection Probe.
3. Inspector > Remove HD Additional Reflection Component.

Actual Result:
NullReferenceException errors are thrown in the console.

Expected Result:
No errors in the console.

Reproducible in:
2020.2.0a10, 2020.2.0a1, with Package Version 9.0.0, 8.1.0, 8.0.1.

Working Fine in:
2020.1.0b8 with Package Version 9.0.0, 8.1.0, 8.0.1.

Environment:
Occurring on Windows 10 & Mac 10.15

Stack trace:
NullReferenceException: Object reference not set to an instance of an object
UnityEditor.Rendering.HighDefinition.HDReflectionProbeEditor.GetTexture (UnityEditor.Rendering.HighDefinition.HDReflectionProbeEditor e, UnityEngine.Object target) (at library/packagecache/com.unity.render-pipelines.high-definition@8.1.0/editor/lighting/reflection/hdreflectionprobeeditor.preview.cs:71)
UnityEditor.Rendering.HighDefinition.HDReflectionProbeEditor.HasPreviewGUI () (at library/packagecache/com.unity.render-pipelines.high-definition@8.1.0/editor/lighting/reflection/hdreflectionprobeeditor.preview.cs:16)
UnityEditor.PropertyEditor.GetEditorsWithPreviews (UnityEditor.Editor[] editors) (at <599a88f0dc984e9a84071cb802b80734>:0)
UnityEditor.PropertyEditor.DrawPreviewAndLabels () (at <599a88f0dc984e9a84071cb802b80734>:0)
UnityEngine.UIElements.IMGUIContainer.DoOnGUI (UnityEngine.Event evt, UnityEngine.Matrix4x4 parentTransform, UnityEngine.Rect clippingRect, System.Boolean isComputingLayout, UnityEngine.Rect layoutSize, System.Action onGUIHandler, System.Boolean canAffectFocus) (at <a22359d5f5034fbc857d5b4e837e47f0>:0)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr, Boolean&)

NullReferenceException: Object reference not set to an instance of an object
UnityEditor.Rendering.HighDefinition.HDReflectionProbeEditor.GetTexture (UnityEditor.Rendering.HighDefinition.HDReflectionProbeEditor e, UnityEngine.Object target) (at library/packagecache/com.unity.render-pipelines.high-definition@8.1.0/editor/lighting/reflection/hdreflectionprobeeditor.preview.cs:71)
UnityEditor.Rendering.HighDefinition.HDReflectionProbeEditor.HasPreviewGUI () (at library/packagecache/com.unity.render-pipelines.high-definition@8.1.0/editor/lighting/reflection/hdreflectionprobeeditor.preview.cs:16)
UnityEditor.PropertyEditor.GetEditorsWithPreviews (UnityEditor.Editor[] editors) (at <599a88f0dc984e9a84071cb802b80734>:0)
UnityEditor.PropertyEditor.DrawPreviewAndLabels () (at <599a88f0dc984e9a84071cb802b80734>:0)
UnityEngine.UIElements.IMGUIContainer.DoOnGUI (UnityEngine.Event evt, UnityEngine.Matrix4x4 parentTransform, UnityEngine.Rect clippingRect, System.Boolean isComputingLayout, UnityEngine.Rect layoutSize, System.Action onGUIHandler, System.Boolean canAffectFocus) (at <a22359d5f5034fbc857d5b4e837e47f0>:0)
UnityEngine.UIElements.IMGUIContainer.HandleIMGUIEvent (UnityEngine.Event e, UnityEngine.Matrix4x4 worldTransform, UnityEngine.Rect clippingRect, System.Action onGUIHandler, System.Boolean canAffectFocus) (at <a22359d5f5034fbc857d5b4e837e47f0>:0)
UnityEngine.UIElements.IMGUIContainer.DoIMGUIRepaint () (at <a22359d5f5034fbc857d5b4e837e47f0>:0)
UnityEngine.UIElements.UIR.RenderChainCommand.ExecuteNonDrawMesh (UnityEngine.UIElements.UIR.DrawParams drawParams, System.Single pixelsPerPoint, System.Exception& immediateException) (at <a22359d5f5034fbc857d5b4e837e47f0>:0)
Rethrow as ImmediateModeException
UnityEngine.UIElements.UIR.RenderChain.Render () (at <a22359d5f5034fbc857d5b4e837e47f0>:0)
UnityEngine.UIElements.UIRRepaintUpdater.Update () (at <a22359d5f5034fbc857d5b4e837e47f0>:0)
UnityEngine.UIElements.VisualTreeUpdater.UpdateVisualTreePhase (UnityEngine.UIElements.VisualTreeUpdatePhase phase) (at <a22359d5f5034fbc857d5b4e837e47f0>:0)
UnityEngine.UIElements.Panel.UpdateForRepaint () (at <a22359d5f5034fbc857d5b4e837e47f0>:0)
UnityEngine.UIElements.Panel.Repaint (UnityEngine.Event e) (at <a22359d5f5034fbc857d5b4e837e47f0>:0)
UnityEngine.UIElements.UIElementsUtility.DoDispatch (UnityEngine.UIElements.BaseVisualElementPanel panel) (at <a22359d5f5034fbc857d5b4e837e47f0>:0)
UnityEngine.UIElements.UIElementsUtility.UnityEngine.UIElements.IUIElementsUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr, System.Boolean& eventHandled) (at <a22359d5f5034fbc857d5b4e837e47f0>:0)
UnityEngine.UIElements.UIEventRegistration.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr) (at <a22359d5f5034fbc857d5b4e837e47f0>:0)
UnityEngine.UIElements.UIEventRegistration+<>c.<.cctor>b__1_2 (System.Int32 i, System.IntPtr ptr) (at <a22359d5f5034fbc857d5b4e837e47f0>:0)
UnityEngine.GUIUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr, System.Boolean& result) (at <5ef95cf9017f426f8b888bbcd7fe1bcc>:0)