Fix optional bodies #3158

Job	Run time
test_min_deps (macos-latest)	1m 13s
Integration Tests (pdm.lock)	22s
test_min_deps (windows-latest)	1m 30s
test_min_deps (ubuntu-latest)	42s
Integration Tests (pdm.minimal.lock)	27s
test (3.10, macos-latest)	1s
test (3.13, macos-latest)	1m 6s
test (3.11, ubuntu-latest)	1m 2s
test (3.11, windows-latest)	1m 5s
test (3.11, macos-latest)	58s
test (3.14, ubuntu-latest)	1m 2s
test (3.12, macos-latest)	1m 8s
test (3.10, windows-latest)	1m 7s
test (3.13, ubuntu-latest)	1m 4s
test (3.14, macos-latest)	1m 7s
test (3.10, ubuntu-latest)	1m 6s
test (3.12, ubuntu-latest)	1m 6s
test (3.12, windows-latest)	1m 6s
test (3.14, windows-latest)	1m 11s
test (3.13, windows-latest)	1m 10s
Combine & check coverage	0s
	19m 33s

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