Code review comment for ~bryce/ubuntu-helpers:add-trigger-class

I've found this on testing against a PPA that exists but has no tests nor builds run yet.

$ lp-test-ppa ppa:paelzer/kinetic-librabbitmq --release kinetic
Tests for PPA kinetic-librabbitmq
---- ---- ---- ----
Release: kinetic
Sources:
  SRC: librabbitmq @ 0.11.0-1~kineticppa1 - Pending
Triggers on published Sources:
Error: Could not retrieve results from http://autopkgtest.ubuntu.com/results/autopkgtest-kinetic-paelzer-kinetic-librabbitmq/?format=plain: HTTP Error 401: Unauthorized
Results: (none yet at http://autopkgtest.ubuntu.com/results/autopkgtest-kinetic-paelzer-kinetic-librabbitmq/?format=plain)
Running: (none)
Waiting: (none)

Maybe while updating the triggers we should harden it to not yield
"Error: Could not retrieve results from http://autopkgtest.ubuntu.com/results/autopkgtest-kinetic-paelzer-kinetic-librabbitmq/?format=plain: HTTP Error 401: Unauthorized"

Instead if should either say nothing or something like "no tests/builds yet"