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Possible fix for exception on direct access to local books
Cannot reproduce so not sure. Fixes #2073972 [[Content Server] Downloaded Books page error when using Custom Book List](https://bugs.launchpad.net/calibre/+bug/2073972)
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@ -62,7 +62,7 @@ def render_field(field, mi, book_id): # {{{
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return book_id + ''
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field_metadata = library_data.field_metadata
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fm = field_metadata[field]
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if not fm:
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if not fm or not mi:
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return
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val = mi[field]
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if val is undefined or val is None:
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