BUG: Fix #61221: Exception with unstack(sort=False) and NA in index. #22726

Job	Run time
Pyodide build	23m 28s
Linux-Musl	16m 54s
Linux-32-bit	18m 59s
python-freethreading	25m 18s
python-dev (macOS-13)	28m 14s
python-dev (macOS-14)	10m 5s
python-dev (ubuntu-22.04)	21m 2s
python-dev (windows-latest)	25m 23s
macos-13 actions-310.yaml	54m 26s
macos-13 actions-311.yaml	50m 28s
macos-13 actions-312.yaml	41m 24s
macos-14 actions-310.yaml	17m 59s
macos-14 actions-311.yaml	13m 17s
macos-14 actions-312.yaml	17m 37s
windows-latest actions-311.yaml	35m 9s
windows-latest actions-312.yaml	47m 10s
windows-latest actions-310.yaml	39m 8s
Minimum Versions	23m 3s
Future infer strings (without pyarrow)	42m 50s
Locale: zh_CN	23m 53s
Locale: it_IT	23m 34s
Downstream Compat	6m 4s
Pyarrow Nightly	21m 14s
Numpy Dev	17m 4s
Pypy	1m 32s
Future infer strings	50m 26s
ubuntu-22.04 actions-310.yaml	49m 0s
ubuntu-22.04 actions-311.yaml	43m 40s
ubuntu-22.04 actions-312.yaml	49m 15s
ubuntu-24.04-arm actions-311.yaml	26m 15s
ubuntu-24.04-arm actions-312.yaml	43m 20s
ubuntu-24.04-arm actions-310.yaml	28m 47s
	15h 35m 58s

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