[docs] [issue20638] KeyError building the Python html doc with sphinx

[Xavier de Gaye]

New submission from Xavier de Gaye:

Occurs on the tip of the Python default branch on ArchLinux when running 'make html PYTHON=python2' from Doc/.
Traceback attached.

----------
assignee: docs at python
components: Documentation
files: sphinx-err-DH3qAl.log
messages: 211311
nosy: docs at python, georg.brandl, xdegaye
priority: normal
severity: normal
status: open
title: KeyError building the Python html doc with sphinx
type: behavior
versions: Python 3.4
Added file: http://bugs.python.org/file34098/sphinx-err-DH3qAl.log

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20638>
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