Migration Plugin

Backtrace:

"error"=>
     {"traceback"=>
       "  File \"/usr/lib/python3.6/site-packages/rq/worker.py\", line 936, in perform_job\n" +
       "    rv = job.perform()\n" +
       "  File \"/usr/lib/python3.6/site-packages/rq/job.py\", line 684, in perform\n" +
       "    self._result = self._execute()\n" +
       "  File \"/usr/lib/python3.6/site-packages/rq/job.py\", line 690, in _execute\n" +
       "    return self.func(*self.args, **self.kwargs)\n" +
       "  File \"/usr/lib/python3.6/site-packages/pulp_2to3_migration/app/tasks/migrate.py\", line 76, in migrate_from_pulp2\n" +
       "    pre_migrate_all_without_content(plan)\n" +
       "  File \"/usr/lib/python3.6/site-packages/pulp_2to3_migration/app/pre_migration.py\", line 493, in pre_migrate_all_without_content\n" +
       "    pre_migrate_importer(repo_id, importer_types)\n" +
       "  File \"/usr/lib/python3.6/site-packages/pulp_2to3_migration/app/pre_migration.py\", line 601, in pre_migrate_importer\n" +
       "    importer.pulp3_remote.delete()\n",
      "description"=>"'NoneType' object has no attribute 'delete'"},
    "worker"=>"/pulp/api/v3/workers/fc6ba1d6-ddc6-494d-9385-2368544a09ef/",

This happened on Katello 3.18.3 which uses:

pulp-2to3-migration (0.11.1)
pulp-certguard (1.0.3)
pulp-container (2.1.2)
pulp-deb (2.7.0)
pulp-file (1.3.0)
pulp-rpm (3.10.0)
pulpcore (3.7.6)