hgwebdir: ignore hgrc parse errors while building the index page

An error in the .hg/hgrc file from a repository would prevent the
following repos from being shown in the index page.

The IOError handling was unnecessary - it's already handled in
readconfig.

This should fix issue731.

The error in the .hg/hgrc file will still prevent the repo from
being exported with hgweb.

mercurial/hgweb/hgwebdir_mod.py

@@ -139,8 +139,9 b' class hgwebdir(object):'
                 u = ui.ui(parentui=parentui)
                 try:
                     u.readconfig(os.path.join(path, '.hg', 'hgrc'))
-                except IOError:
-                    pass
+                except Exception, e:
+                    u.warn(_('error reading %s/.hg/hgrc: %s\n' % (path, e)))
+                    continue
                 def get(section, name, default=None):
                     return u.config(section, name, default, untrusted=True)