DEV-18256: Fix prince PDF generation on pre-`rc.17` projects

thegetty / quire

A multi-package repository for the Quire multiformat publishing framework

https://quire.getty.edu/

BSD 3-Clause "New" or "Revised" License

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Closed cbutcosk closed 2 months ago

cbutcosk commented 2 months ago

This PR fixes DEV-18256 Error running PrinceXML with cli rc.14 on older projects by adding a synchronous check for the PDF covers file.