BUG: Fix #61221: Exception with unstack(sort=False) and NA in index. #22867

Job	Run time
Linux-32-bit	18m 51s
Linux-Musl	16m 31s
Pyodide build	21m 23s
python-freethreading	21m 14s
python-dev (macOS-13)	21m 26s
python-dev (macOS-14)	9m 17s
python-dev (ubuntu-22.04)	19m 59s
python-dev (windows-latest)	21m 16s
macos-13 actions-310.yaml	21m 33s
macos-13 actions-311.yaml	21m 32s
macos-13 actions-312.yaml	21m 25s
macos-14 actions-310.yaml	17m 30s
macos-14 actions-311.yaml	16m 56s
macos-14 actions-312.yaml	14m 8s
windows-latest actions-311.yaml	21m 23s
windows-latest actions-312.yaml	21m 24s
windows-latest actions-310.yaml	21m 23s
Minimum Versions	21m 26s
Future infer strings (without pyarrow)	26m 9s
Locale: zh_CN	21m 25s
Locale: it_IT	21m 26s
Downstream Compat	5m 41s
Numpy Dev	16m 32s
Pyarrow Nightly	20m 15s
Future infer strings	26m 12s
Pypy	1m 30s
ubuntu-22.04 actions-310.yaml	26m 12s
ubuntu-22.04 actions-311.yaml	26m 10s
ubuntu-22.04 actions-312.yaml	26m 9s
ubuntu-24.04-arm actions-311.yaml	21m 25s
ubuntu-24.04-arm actions-312.yaml	21m 24s
ubuntu-24.04-arm actions-310.yaml	21m 27s
	10h 30m 34s

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