useGUILayout = false spams console.

If a project uses GUILayout with MonoBehaviour.useGUILayout set to false, the console is spammed with the following error:
ArgumentException: Getting control 1's position in a group with only 1 controls when doing Repaint
Aborting

Repro:
Play the scene in the attached project, and toggle GUI control.

Result:
ArgumentException: Getting control... is thrown in every OnGUI call.

Expected:
Graceful and explanatory error message.
E.g. "Control [control_id] on [object] can't be drawn because useGUILayout is disabled"