Remove empty tuple from SExp (#335) #1501

Job	Run time
Run fuzz targets (macos-latest, 3.7)	40m 17s
Run fuzz targets (ubuntu-latest, 3.7)	31m 41s
Unit tests (macos-latest, 3.7)	7m 3s
Unit tests (ubuntu-latest, 3.7)	6m 20s
Unit tests (windows-latest, 3.7)	9m 13s
Wheel on macos-latest py-3.7	5m 12s
Wheel on ubuntu-latest py-3.7	4m 26s
Wheel on windows-latest py-3.7	4m 5s
coverage	26m 18s
Checks	1m 7s
	2h 15m 42s

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