make html fails

[djmitche]

Exception occurred:
  File "/home/dustin/code/moz/t/relengdocs/sandbox/lib/python2.7/site-packages/sphinx/writers/html.py", line 353, in depart_caption
    node.parent.traverse(nodes.image)[0], _('Permalink to this image'))
IndexError: list index out of range
The full traceback has been saved in /tmp/sphinx-err-6HqZwg.log, if you want to report the issue to the developers.
Please also report this if it was a user error, so that a better error message can be provided next time.
A bug report can be filed in the tracker at <https://github.com/sphinx-doc/sphinx/issues>. Thanks!
Makefile:53: recipe for target 'html' failed
make: *** [html] Error 1

This is with a fresh pip install -r rtfd-requirements.txt

[hwine]

docs build almost clean with sphinx-1.2.3 -- only warning is:

copying static files... WARNING: html_static_path entry u'/private/tmp/build-relengdocs/_static' does not exist

[hwine]

Looks like a variant of sphinx-doc/sphinx#1788

While that bug is closed, it hasn't shipped yet: sphinx-doc/sphinx@11f9b5f

[hwine]

Closed with @64bf728 - successful build on rtd.org