fix: robustify parse of broken pdfs

[PeterStaar-IBM]

command

uv run python ./perf/run_perf.py -p docling ./broken_pdfs

before:

Summary for parser=docling
 - files:        96
 - pages total:  96
 - pages ok:     1
 - pages failed: 95
 - total sec:    0.026838
 - avg sec/page: 0.026838
 - p50: 0.026838  p90: 0.026838  p95: 0.026838  p99: 0.026838
 - min: 0.026838  max: 0.026838

after:

Summary for parser=docling
 - files:        96
 - pages total:  96
 - pages ok:     94
 - pages failed: 2
 - total sec:    12.991205
 - avg sec/page: 0.138204
 - p50: 0.053474  p90: 0.264782  p95: 0.495950  p99: 1.683184
 - min: 0.004947  max: 2.489215

broken_pdfs.zip

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