Error message when image cannot be found could be improved
When a reference to a figure is made in the .rst files but the figure itself does not exist, the following message is shown on make html
Exception occurred: File "/usr/local/lib/python2.7/dist-packages/docutils-0.9.1-py2.7.egg/docutils/writers/html4css1/init.py", line 1026, in visit_image and self.settings.file_insertion_enabled): AttributeError: Values instance has no attribute 'file_insertion_enabled' The full traceback has been saved in /tmp/sphinx-err-Lr10E0.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.
This could be more user friendly, perhaps with a list of missing image reference.