also test Function move construction from empty Function
Summary: The `Emptiness_T` test already tests the emptiness of a default-constructed Function as well as one that was assigned an empty Function. This diff adds a test for a Function that was move-constructed from an empty Function. Reviewed By: shixiao Differential Revision: D8818468 fbshipit-source-id: 3f0e04b9f0f44df2de45fc972a2d26e12adc7362
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