When creating a new post on python 3.5.2 with a single author, there always
appears another author of None appended to the list when pulling
content.get_authors() from templates, this causes the multiple authors code in
the pure theme to subsequently crash when it can't pull the display name of
None. Line 45, quokka/themes/pure/templates/_menu.html {%for author in
content.get_authors()|sort(attribute="display_name")%}
jinja2.exceptions.UndefinedError: 'None' has no attribute 'display_name'
When debugging at this breakpoint: >>> content.get_authors() set([>,
None]) Another interesting behavior is that selecting no author will not
cause a “None” entry, and that trying to remove authors from the list and
hitting save does nothing, while adding new authors does work.