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EPUB Output: Fix an error causing conversion to fail when outputting to EPUB 3 and the input document has no preexisting nav. Fixes #1773533 [epub to epub conversion failed due to Python problem](https://bugs.launchpad.net/calibre/+bug/1773533)

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Kovid Goyal 2018-05-27 08:29:22 +05:30
parent b3fc627990
commit 6af9997c7c
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1 changed files with 2 additions and 1 deletions
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src/calibre/ebooks/conversion/plugins/epub_output.py
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@ -298,7 +298,8 @@ class EPUBOutput(OutputFormatPlugin):
from calibre.ebooks.oeb.polish.upgrade import epub_2_to_3
existing_nav = getattr(self.opts, 'epub3_nav_parsed', None)
nav_href = getattr(self.opts, 'epub3_nav_href', None)
epub_2_to_3(container, self.log.info, previous_nav=(nav_href, existing_nav))
previous_nav = (existing_nav, nav_href) if existing_nav and nav_href else None
epub_2_to_3(container, self.log.info, previous_nav=previous_nav)
fix_conversion_titlepage_links_in_nav(container)
container.commit()
os.remove(f.name)