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.
#!/bin/sh
hg init a
echo a > a/a
hg --cwd a ci -A -m a
hg clone a b
echo b > b/b
hg --cwd b ci -A -m b
chmod 100 a/.hg/store
hg --cwd b push ../a
chmod 700 a/.hg/store