mercurial/templates/rss/filelog.tmpl

chgserver: handle ParseError during validate

Currently the validate command in chgserver expects config can be loaded
without issues but the config can be broken and chg will print a stacktrace
instead of the parsing error, if a chg server is already running.

This patch adds a handler for ParseError in validate and a new instruction
"exit" to make the client exit without abortmsg. A test is also added to make
sure it will behave as expected.

{header}
    <title>{repo|escape}: {file|escape} history</title>
    <description>{file|escape} revision history</description>
    {entries%filelogentry}
  </channel>
</rss>