#104 drops core while trying to find next echo with unread

[Eric Pozharski]

The msged relieble drops core in following circumstances: a current echo has no unread messages; echos are sorted by group (of fidoconfig) then names (so the main listing is split by group categories); there isn't echo with unread messages in the current group; then if press '+' (search for the next echo with unread messages) (for clarity, should view the last message in the echo) bad thing happen.

[Eric Pozharski]

bugreport asociated data

[Robert James Clay]

This is quite old; will need to verify if the issue is still present and/or has already been resolved.