After a script is deleted, it is impossible to see the 'Missing Behavior' component to remove it from game objects it was assigned to.

To reproduce:

1. Download attached project "BehaviourMissing.zip" and open in Unity
2. Open "BehaviourMissing" scene
3. Enter to Play mode

To reproduce from scratch:
1. Create a C# Script called "TestingScript.cs"
2. Create a "TestingGameObject" GameObject in the Scene
3. Assign TestingScript.cs to TestingGameObject
4. Run. Ensure no warnings
5. Delete TestingScript.cs. Do not delete TestingGameObject
6. Look at TestingGameObject. It says it is missing the script (normal)
7. Run.
8. Warning about missing behavior appears (NORMAL & EXPECTED)
9. Stop the Scene
10. Look at the TestingGameObject

Expected Result: GameObject should have an empty script entry with 'Missing Behaviour' so you can add a new one or remove it.
Actual Result: The missing behavior can not be seen. No way to delete or reassign it. You need to delete the game object to get rid of the warnings.

Reproduced on Unity 2017.1.0b6, 2017.1.0b8 and 2017.2.0a2
Not reproduced on Unity 2017.1.0b5
Regression on Unity 2017.1.0b6