%vitals causes %spider to crash when checking unknown ship

[polwex]

When calling the %run-check poke on the %vitals app, the underlying thread fails causing a cascade of %spider and the whole Gall to crash.

Steps to reproduce the behavior:
Poke %vitals with an unknown ship.

Possible solution
Discussed with ~tinnus-napbus on Guild Hall and we found the bug in the scry run under ++get-qos in /garden/ted/vitals/connection-check. It crashes when the ship is unknown to ames.
A solution could be to change the scry for a .^((map ship ?(%alien %known)) %ax /=//=/peers), then do a has:by for the ships in question, and return some error message if %.n.

Happy to PR the fix myself.

Screenshot follows: