Server doesn't run newly added test if package had none

I'm adding the first dep8 test to the package src:bind-dyndb-ldap, and using a PPA to test it in the infrastructure. Turns out when I try to trigger a test, I get back this error:

You submitted an invalid request: Package bind-dyndb-ldap does not have any test results

It looks like the server is considering the package in the archive, and not in the ppa, when deciding whether it has dep8 tests to run or not.

This is the URL I'm using:

https://autopkgtest.ubuntu.com/request.cgi?release=mantic&package=bind-dyndb-ldap&ppa=ahasenack/bind9-dyndb-ldap&arch=amd64&&trigger=bind-dyndb-ldap/11.10-5ubuntu1~ppa1

The code is in https://code.launchpad.net/~ahasenack/ubuntu/+source/bind-dyndb-ldap/+git/bind-dyndb-ldap/+ref/mantic-dyndb-ldap-dep8