NullReferenceException error is thrown on resetting "HD Additional Light Data" component.

Steps to repro:
1. Open the attached project.
2. Select Directional Light.
3. Reset "HD Additional Light Data" component.

Actual Result:
NullReferenceException error is thrown in the console.

Expected Result:
No error in the console.

Reproducible in:
2020.1.0a24.3133(0efcce64deba), 2019.3.2f1, 2019.2.0f1, 2019.1.14f1, 2019.1.0b2.

Working fine in:
2019.1.0b1 with Package Version 5.2.3-preview.

Environment:
Occurring on Windows 10 & Mac 10.15.

Stack trace:
NullReferenceException: Object reference not set to an instance of an object
UnityEngine.Component.TryGetComponent[T] (T& component) (at <881f56cb7996431bbecda1740f3e7a98>:0)
UnityEngine.Rendering.HighDefinition.HDAdditionalLightData.get_legacyLight () (at Library/PackageCache/com.unity.render-pipelines.high-definition@7.2.1/Runtime/Lighting/Light/HDAdditionalLightData.cs:1443)
UnityEngine.Rendering.HighDefinition.HDAdditionalLightData.get_type () (at Library/PackageCache/com.unity.render-pipelines.high-definition@7.2.1/Runtime/Lighting/Light/HDAdditionalLightData.Types.cs:232)
UnityEngine.Rendering.HighDefinition.HDAdditionalLightData.UpdateBounds () (at Library/PackageCache/com.unity.render-pipelines.high-definition@7.2.1/Runtime/Lighting/Light/HDAdditionalLightData.cs:2421)
UnityEngine.Rendering.HighDefinition.HDAdditionalLightData.UnityEngine.ISerializationCallbackReceiver.OnBeforeSerialize () (at Library/PackageCache/com.unity.render-pipelines.high-definition@7.2.1/Runtime/Lighting/Light/HDAdditionalLightData.Migration.cs:159)