When opening a project, if the user preference "LastOpenedScene" is set but the scene does not exist in the project, an exception is thrown:

ArgumentException: Scene file not found: 'MyScene.unity'.
at (wrapper managed-to-native) UnityEditor.SceneManagement.EditorSceneManager.OpenScene_Injected(string,UnityEditor.SceneManagement.OpenSceneMode,UnityEngine.SceneManagement.Scene&)
at UnityEditor.SceneManagement.EditorSceneManager.OpenScene (System.String scenePath, UnityEditor.SceneManagement.OpenSceneMode mode) <0x195b5c730 + 0x0006a> in <d31e8d7dbcc24e419237a5e086ab705e>:0
at UnityEditor.EditorApplication.Internal_RestoreLastOpenedScenes () [0x00030] in /Users/alexey/Unity/unity/graphics/Editor/Mono/EditorApplication.cs:514

If this starts failing once, you are stuck with this exception until you open a project that either has this scene, or sets the preference key to another value.

Steps to reproduce:
- Create an empty 3d project.
- Close the project
- In a command line, write (or any other command to open unity with arguments) : "path/to/unity -projectpath path/to/my/project -openscene potato"
- The project will open with an exception in the console. Now, every time you open unity (without -openscene), with this project or another, you will get this exception.