document.page_for_id: catch empty imageFilename case #25
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Fixes #18 – previous fix was only partially related. (I'll also raise a true exception in core in
workspace.image_from_page
here, but we'll need this workaround anyway.)Use-case is (workspaces with results from)
ocrd-fileformat-transform -P "alto page"
which does not ensure@imageFilename
.