hocr: only add space if boxwidth is positive #609

Job	Run time
Build sdist and wheels	12s
Test Windows (windows-latest, 3.10)	7m 57s
Test macOS (macos-latest, 3.10)	5m 17s
Test Windows (windows-latest, 3.11)	7m 24s
Test ubuntu-22.04 with Python 3.10	5m 3s
Test macOS (macos-latest, 3.11)	6m 13s
Test Windows (windows-latest, 3.12)	7m 58s
Test macOS (macos-latest, 3.12)	6m 34s
Test ubuntu-22.04 with Python 3.11	4m 57s
Test macOS (macos-latest, 3.13)	6m 20s
Test Windows (windows-latest, 3.13)	8m 5s
Test ubuntu-22.04 with Python 3.12	5m 36s
Test macOS (macos-13, 3.10)	14m 9s
Test macOS (macos-13, 3.11)	14m 50s
Test macOS (macos-13, 3.12)	12m 55s
Test ubuntu-22.04 with Python 3.13	5m 14s
Test macOS (macos-13, 3.13)	10m 25s
Test ubuntu-24.04 with Python 3.10	4m 41s
Test ubuntu-24.04 with Python 3.11	4m 51s
Test ubuntu-24.04 with Python 3.12	6m 15s
Test ubuntu-24.04 with Python 3.13	5m 2s
Test ubuntu-24.04 with Python pypy3.10	12m 9s
Build Ubuntu-based Docker image	0s
Build Alpine-based Docker images	0s
Deploy artifacts to PyPI	0s
Create GitHub release	0s
	2h 42m 7s

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