This is the same code that is spamming ~registry. That code is also not checking that the project uses Launchpad bugs. Consider that the upstream bug report uses the bug supervisor for a registered upstream project; users may be in that role for other reason then receive email.
This is the same code that is spamming ~registry. That code is also not checking that the project uses Launchpad bugs. Consider that the upstream bug report uses the bug supervisor for a registered upstream project; users may be in that role for other reason then receive email.