Sunspot server stop should not raise error if process not running

[cpjolicoeur]

When running the rake task to stop sunspot's solr server, the process should not throw an exception and halt if the PID process is not currently running.

The whole point is that we want the server to stop; if the process is not running, it is in essense stopped, and we can just log a message/warning to that effect and proceed on to remove said PID file and continue.

I'd be happy to submit the patch for this if the mods are agreeable.

[alindeman]

Patches welcomed, sure. This sounds reasonable.

[benmoss]

Closing due to being ancient, feel free to reopen if you want to submit a pull request