Steps to reproduce:
1. Download and open attached project.
2. Notice that the "Console" window outputs:

"A default asset was created for 'Assets/HoloToolkit/Utilities/Prefabs/FPSDisplay.prefab' because the asset importer crashed on it last time.
You can select the asset and use the 'Assets -> Reimport' menu command to try importing it again, or you can replace the asset and it will auto import again."

3. Press "Assets->Reimport All" and wait until the assets will be re-imported.

Actual result:
The Editor crashes and "Unity Bug Reporter" window appears, so the asset cannot be imported.

Expected result:
The Editor should not crash when trying to re-import this asset.

Reproduced with:
5.1.0f3, 5.2.4f1, 5.3.4f1, 5.3.5f1.

Cannot reproduce with:
5.3.4p4, 5.4.0b23. There are some compiler errors that prevents the user from entering the play mode. When I try re-importing the assets, this window appears:
"GetManagerFromContext: pointer to object of manager 'MonoManager' is NULL (table index 5)”. (This issue might be reproducible on my machine only).