hgwebdir: handle IOErrors from localrepo while enumerating
Repository() raises a number of IOErrors in addition to RepoErrors.
these are just as uninteresting as RepoErrors and should be ignored
The easiest case of this is a repo whose .hg/ directory is -rx
.. Common link and substitution definitions.
.. |hg(1)| replace:: **hg**\ (1)
.. _hg(1): hg.1.html
.. |hgrc(5)| replace:: **hgrc**\ (5)
.. _hgrc(5): hgrc.5.html
.. |hgignore(5)| replace:: **hgignore**\ (5)
.. _hgignore(5): hgignore.5.html