Crash In FGeometryCacheSceneProxy::GetDynamicMeshElements On Editor Load With Null Material

1. Create a BP with a GeometryCache component
2. Assign a Geometry Cache asset to the component that has a valid source file and at least one material assigned to it
3. Save the BP
4. Take note of the first material referenced by the geometry cache asset
5. Close the editor
6. Delete (or rename) locally the material referenced by the geometry cache (this is to simulate the situation that a file was not submitted on Perforce with the geometry cache asset)
7. Open the editor
8. Place the BP in a level. If you don't have the fix, it should crash. With the fix, you should reach this ensure:

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