Fix empty migrate #1407

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Run time

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Job	Run time
tests (ubuntu-20.04, 3.8)	4m 1s
tests (ubuntu-20.04, 3.9)	4m 10s
tests (ubuntu-20.04, 3.10)	3m 58s
tests (ubuntu-20.04, 3.11)	4m 44s
tests (windows-latest, 3.8)	9m 4s
tests (windows-latest, 3.9)	7m 42s
tests (windows-latest, 3.10)	9m 38s
tests (windows-latest, 3.11)	9m 20s
tests (macos-latest, 3.8)	8m 40s
tests (macos-latest, 3.9)	9m 54s
tests (macos-latest, 3.10)	9m 50s
tests (macos-latest, 3.11)	5m 29s
tests (ubuntu-latest, pypy3.8)	9m 43s
	1h 36m 13s