BUG: Fix #61221: Exception with unstack(sort=False) and NA in index. #22933

Job	Run time
Pyodide build	23m 12s
Linux-32-bit	18m 12s
Linux-Musl	16m 42s
python-freethreading	22m 11s
python-dev (macOS-13)	18m 40s
python-dev (ubuntu-22.04)	20m 33s
python-dev (macOS-14)	9m 50s
python-dev (windows-latest)	22m 34s
macos-13 actions-310.yaml	21m 51s
macos-13 actions-311.yaml	41m 24s
macos-13 actions-312.yaml	38m 32s
macos-14 actions-310.yaml	17m 53s
macos-14 actions-311.yaml	14m 45s
macos-14 actions-312.yaml	15m 47s
windows-latest actions-311.yaml	33m 5s
windows-latest actions-312.yaml	39m 39s
windows-latest actions-310.yaml	32m 38s
Minimum Versions	23m 21s
Future infer strings (without pyarrow)	37m 58s
Locale: zh_CN	23m 22s
Locale: it_IT	23m 34s
Downstream Compat	5m 45s
Numpy Dev	16m 46s
Pyarrow Nightly	21m 27s
Future infer strings	45m 8s
Pypy	1m 16s
ubuntu-22.04 actions-310.yaml	46m 6s
ubuntu-22.04 actions-311.yaml	42m 13s
ubuntu-22.04 actions-312.yaml	44m 26s
ubuntu-24.04-arm actions-311.yaml	34m 40s
ubuntu-24.04-arm actions-312.yaml	34m 43s
ubuntu-24.04-arm actions-310.yaml	35m 41s
	14h 3m 54s

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