Fix optional bodies #3161

Job	Run time
test_min_deps (macos-latest)	42s
test_min_deps (ubuntu-latest)	41s
test_min_deps (windows-latest)	1m 12s
Integration Tests (pdm.lock)	28s
Integration Tests (pdm.minimal.lock)	25s
test (3.10, macos-latest)	52s
test (3.10, ubuntu-latest)	1m 5s
test (3.11, macos-latest)	45s
test (3.12, ubuntu-latest)	1m 6s
test (3.11, windows-latest)	1m 42s
test (3.12, windows-latest)	1m 56s
test (3.11, ubuntu-latest)	1m 2s
test (3.13, ubuntu-latest)	1m 10s
test (3.13, windows-latest)	1m 36s
test (3.10, windows-latest)	1m 44s
test (3.13, macos-latest)	56s
test (3.12, macos-latest)	1m 1s
test (3.14, windows-latest)	1m 35s
test (3.14, macos-latest)	47s
test (3.14, ubuntu-latest)	1m 6s
Combine & check coverage	11s
	22m 2s

Provide feedback