FIX: Resolve KeyError with LaTeX headers in to_latex method #19700

Job	Run time
Pyodide build	17m 10s
Linux-32-bit	17m 1s
Linux-Musl	17m 1s
macos-13 actions-310.yaml	17m 18s
macos-13 actions-311.yaml	17m 18s
macos-13 actions-312.yaml	20m 8s
macos-14 actions-310.yaml	17m 25s
macos-14 actions-311.yaml	6m 18s
macos-14 actions-312.yaml	17m 23s
windows-latest actions-311.yaml	17m 12s
windows-latest actions-312.yaml	17m 13s
windows-latest actions-310.yaml	17m 10s
python-freethreading	17m 9s
python-dev (macOS-13)	17m 12s
python-dev (macOS-14)	9m 53s
python-dev (ubuntu-22.04)	17m 13s
python-dev (windows-latest)	17m 9s
ubuntu-latest actions-310.yaml	21m 57s
Minimum Versions	17m 14s
ubuntu-latest actions-311.yaml	21m 59s
Locale: zh_CN	17m 15s
Future infer strings (without pyarrow)	21m 58s
Locale: it_IT	17m 14s
Downstream Compat	6m 16s
Numpy Dev	17m 1s
Pyarrow Nightly	17m 13s
ubuntu-latest actions-312.yaml	21m 58s
Future infer strings	21m 58s
Pypy	1m 12s
	8h 0m 28s

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