-OcclusionCullingData asset does not create in the Project window if the scene is not saved(untitled).
-The untitled scene is not searchable during occlusion culling which leads to "No asset directory" error in the console.

Steps to repro:
1. Create a new Project.
2. Create a new scene(Don't Save the scene)
3. Create static Cube game object > Add LOD Group.
4. Windows > Rendering > Occlusion Culling > Bake.

Actual Result:
OcclusionCullingData asset does not create in the Project window.

Expected Result:
It should ask to save the scene and Culling data asset should be created in the Project window.

Reproducible in:
2020.2.0a7, 2020.1.0b6, 2019.3.9f1, 2019.2.0f1, 2019.1.0f1, 2018.4.16f1, 2018.3.0f1, 2018.2.0f1, 2018.1.0f1, 2017.1.5f1.

Environment:
Occurring on Windows 10 & Mac 10.15.