fix traceback in hgweb when URL doesn't end in one of the archive specs...
fix traceback in hgweb when URL doesn't end in one of the archive specs
If the last n charecters of the URL doesn't match an entry in archive_specs
req.form never has a key 'type'. When achive() looks up 'type' in the form
dict it causes a traceback rather than printing an error message.