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Fix exception arising when someone empties the author link template box.
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@ -143,6 +143,8 @@ def render_data(mi, use_roman_numbers=True, all_fields=False):
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vals['author_sort'] = aut.replace(' ', '+')
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link = formatter.safe_format(
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gprefs.get('default_author_link'), vals, '', vals)
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else:
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link = ''
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if link:
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link = prepare_string_for_xml(link)
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authors.append(u'<a href="%s">%s</a>'%(link, aut))
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