BUG: Fix inconsistency of converting empty categorical with dtype_bac… #22499

Job	Run time
Linux-32-bit	18m 38s
Linux-Musl	16m 39s
Pyodide build	23m 22s
macos-13 actions-310.yaml	29m 37s
macos-13 actions-312.yaml	33m 42s
macos-13 actions-311.yaml	45m 38s
macos-14 actions-310.yaml	19m 46s
macos-14 actions-311.yaml	18m 50s
macos-14 actions-312.yaml	18m 24s
windows-latest actions-312.yaml	46m 40s
windows-latest actions-311.yaml	37m 7s
windows-latest actions-310.yaml	34m 21s
python-freethreading	24m 20s
python-dev (macOS-13)	16m 23s
python-dev (ubuntu-22.04)	20m 23s
python-dev (windows-latest)	22m 17s
python-dev (macOS-14)	12m 25s
Minimum Versions	24m 39s
Future infer strings (without pyarrow)	41m 57s
Locale: zh_CN	23m 22s
Locale: it_IT	24m 29s
Downstream Compat	5m 58s
Numpy Dev	16m 53s
Pyarrow Nightly	20m 19s
Future infer strings	52m 49s
Pypy	1m 14s
ubuntu-22.04 actions-311.yaml	44m 57s
ubuntu-22.04 actions-310.yaml	48m 39s
ubuntu-22.04 actions-312.yaml	49m 8s
ubuntu-24.04-arm actions-311.yaml	25m 54s
ubuntu-24.04-arm actions-312.yaml	46m 33s
ubuntu-24.04-arm actions-310.yaml	46m 9s
	15h 11m 32s

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