rr ps prints misleading error message when ~/.rr doesn't exist #1583
Description
$ rr ps
rr: error: Version file for recorded trace `/home/user/.rr/latest-trace/version' not found. Did you record
`/home/user/.rr/latest-trace/version' with an older version of rr? If so, you'll need to replay
`/home/user/.rr/latest-trace/version' with that older version. Otherwise, your trace is
likely corrupted.
To avoid confused first-time users, it should probably detect this case and print a more useful error message (something along the lines of "No traces have been recorded yet").