Fix optional bodies #3159

Job	Run time
Integration Tests (pdm.lock)	23s
test_min_deps (ubuntu-latest)	38s
test_min_deps (windows-latest)	1m 57s
test_min_deps (macos-latest)	1m 16s
Integration Tests (pdm.minimal.lock)	31s
test (3.10, ubuntu-latest)	1m 9s
test (3.11, macos-latest)	58s
test (3.10, macos-latest)	57s
test (3.11, ubuntu-latest)	1m 3s
test (3.10, windows-latest)	1m 3s
test (3.14, windows-latest)	1m 4s
test (3.13, macos-latest)	1m 3s
test (3.13, windows-latest)	1m 7s
test (3.13, ubuntu-latest)	1m 8s
test (3.14, macos-latest)	51s
test (3.14, ubuntu-latest)	1m 2s
test (3.12, ubuntu-latest)	1m 6s
test (3.11, windows-latest)	1m 6s
test (3.12, macos-latest)	1s
test (3.12, windows-latest)	1m 6s
Combine & check coverage	-1s
	19m 28s

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