BUG: Add fillna at the beginning of _where not to fill NA. #60729 #21569

Job	Run time
Pyodide build	22m 58s
Linux-32-bit	19m 10s
Linux-Musl	21m 25s
python-freethreading	22m 58s
python-dev (macOS-13)	31m 3s
python-dev (macOS-14)	11m 31s
python-dev (ubuntu-22.04)	20m 12s
macos-13 actions-310.yaml	27m 31s
macos-13 actions-311.yaml	35m 1s
python-dev (windows-latest)	24m 1s
macos-13 actions-312.yaml	34m 22s
macos-14 actions-310.yaml	22m 4s
macos-14 actions-311.yaml	15m 44s
macos-14 actions-312.yaml	18m 24s
windows-latest actions-311.yaml	36m 31s
windows-latest actions-312.yaml	46m 36s
windows-latest actions-310.yaml	35m 2s
Minimum Versions	23m 31s
Future infer strings (without pyarrow)	39m 42s
Locale: zh_CN	23m 46s
Locale: it_IT	23m 56s
Downstream Compat	5m 39s
Numpy Dev	16m 52s
Pyarrow Nightly	20m 3s
Future infer strings	46m 22s
Pypy	1m 47s
ubuntu-22.04 actions-310.yaml	45m 42s
ubuntu-22.04 actions-311.yaml	41m 59s
ubuntu-22.04 actions-312.yaml	45m 28s
ubuntu-24.04-arm actions-311.yaml	32m 44s
ubuntu-24.04-arm actions-312.yaml	36m 49s
ubuntu-24.04-arm actions-310.yaml	33m 31s
	14h 42m 24s

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