BUG: Fix #61221: Exception with unstack(sort=False) and NA in index. #22746

Job	Run time
Linux-32-bit	18m 49s
Linux-Musl	16m 57s
python-dev (macOS-13)	22m 29s
python-dev (macOS-14)	11m 57s
python-dev (ubuntu-22.04)	21m 24s
python-dev (windows-latest)	22m 17s
python-freethreading	22m 25s
Pyodide build	22m 24s
macos-13 actions-310.yaml	22m 28s
macos-13 actions-311.yaml	22m 35s
macos-13 actions-312.yaml	22m 29s
macos-14 actions-310.yaml	22m 28s
macos-14 actions-311.yaml	14m 47s
macos-14 actions-312.yaml	14m 47s
windows-latest actions-312.yaml	22m 11s
windows-latest actions-311.yaml	22m 22s
windows-latest actions-310.yaml	22m 24s
Minimum Versions	22m 27s
Future infer strings (without pyarrow)	27m 11s
Locale: zh_CN	22m 25s
Locale: it_IT	22m 26s
Downstream Compat	5m 54s
Pyarrow Nightly	21m 1s
Numpy Dev	17m 0s
Future infer strings	27m 10s
Pypy	1m 13s
ubuntu-22.04 actions-310.yaml	27m 11s
ubuntu-22.04 actions-311.yaml	27m 10s
ubuntu-22.04 actions-312.yaml	27m 10s
ubuntu-24.04-arm actions-311.yaml	22m 25s
ubuntu-24.04-arm actions-310.yaml	27m 10s
ubuntu-24.04-arm actions-312.yaml	27m 10s
	11h 10m 16s

Provide feedback