Fix optional bodies #3160

Job	Run time
test_min_deps (macos-latest)	49s
test_min_deps (ubuntu-latest)	38s
test_min_deps (windows-latest)	1m 0s
Integration Tests (pdm.lock)	23s
Integration Tests (pdm.minimal.lock)	32s
test (3.10, ubuntu-latest)	59s
test (3.10, macos-latest)	57s
test (3.12, macos-latest)	44s
test (3.11, ubuntu-latest)	1m 0s
test (3.10, windows-latest)	55s
test (3.13, ubuntu-latest)	59s
test (3.12, ubuntu-latest)	1m 1s
test (3.13, windows-latest)	52s
test (3.13, macos-latest)	53s
test (3.14, ubuntu-latest)	59s
test (3.11, windows-latest)	53s
test (3.12, windows-latest)	53s
test (3.14, macos-latest)	54s
test (3.11, macos-latest)	1s
test (3.14, windows-latest)	51s
Combine & check coverage	0s
	16m 13s

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