autodoc warns without giving the source file name

[shimizukawa]

When a docstring in some code contains invalid markup, autodoc issues a warning, but often it gives no useful information about where the invalid markup is located. It just says "''" as the source. Here is a patch which makes autodoc include source information for all detected warnings. Note that I did not test very thoroughly. But it works for me.

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• Bitbucket: https://bitbucket.org/birkenfeld/sphinx/issue/1656
• Originally reported by: Luc Saffre
• Originally created at: 2014-12-23T21:09:39.310