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Fix #2027: `make epub got errors if html_title` is None
Sphinx does not expect setting None value as ``html_title`` in spite of documented. This changed that to deny None value as ``html_title``.
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@@ -565,8 +565,7 @@ that use Sphinx's HTMLWriter class.
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The "title" for HTML documentation generated with Sphinx's own templates.
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This is appended to the ``<title>`` tag of individual pages, and used in the
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navigation bar as the "topmost" element. It defaults to :samp:`'{<project>}
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v{<revision>} documentation'` (with the values coming from the config
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values).
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v{<revision>} documentation'`.
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.. confval:: html_short_title
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