Forward server stderr when errlog has no file descriptor #3911

Job	Run time
checks / docs	53s
checks / readme-snippets	16s
checks / test (3.13, locked, ubuntu-latest)	1m 21s
checks / test (3.13, locked, windows-latest)	1m 41s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 11s
checks / test (3.10, lowest-direct, windows-latest)	2m 0s
checks / test (3.11, lowest-direct, windows-latest)	1m 32s
checks / test (3.12, locked, windows-latest)	2m 0s
checks / test (3.10, locked, ubuntu-latest)	1m 26s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 22s
checks / test (3.12, locked, ubuntu-latest)	1m 39s
checks / pre-commit	49s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 14s
checks / test (3.14, locked, windows-latest)	1m 56s
checks / test (3.11, locked, windows-latest)	1m 58s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 18s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 16s
checks / test (3.14, lowest-direct, windows-latest)	1m 44s
checks / test (3.11, locked, ubuntu-latest)	1m 35s
checks / test (3.12, lowest-direct, windows-latest)	1m 59s
checks / test (3.10, locked, windows-latest)	1m 47s
checks / test (3.13, lowest-direct, windows-latest)	1m 56s
checks / test (3.14, locked, ubuntu-latest)	1m 22s
all-green	3s
	34m 18s

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