Pulp2 to pulp3 migration fails on certain repos during "satellite-maintain content prepare" step with FileNotFoundError: [Errno 2] No such file or directory: '' in prepare_metadata_files

Issue

• 'satellite-maintain content prepare' stop with error:

  ForemanTasks::TaskError: Task b2b5e67f-6dcf-498e-aebf-bf018f292101: Katello::Errors:Pulp3Error: 2 subtask(s) failed for task group /pulp/api/v3/task-groups/0c042b87-877d-4061-bf61-05fd73c4a69b/

• Traceback error caught on log:

Feb 10 10:34:11 mysat6 pulpcore-worker-2: pulp: pulp_rpm.app.tasks.publishing:INFO: Publishing: repository=cv-test-Red_Hat_Ansible_Engine_2_6_RPMs_for_Red_Hat_Enterprise_Linux_7_Server_x86_64, version=4
:
Feb 10 10:34:12 mysat6 pulpcore-worker-2: pulp: rq.worker:ERROR: Traceback (most recent call last):
Feb 10 10:34:12 mysat6 pulpcore-worker-2: File "/usr/lib/python3.6/site-packages/rq/worker.py", line 936, in perform_job
:
Feb 10 10:34:12 mysat6 pulpcore-worker-2: self.repomdrecords = self.prepare_metadata_files(main_content)
Feb 10 10:34:12 maysat6 pulpcore-worker-2: File "/usr/lib/python3.6/site-packages/pulp_rpm/app/tasks/publishing.py", line 99, in prepare_metadata_files
Feb 10 10:34:12 mysat6 pulpcore-worker-2: with open(path, "wb") as new_file:
Feb 10 10:34:12 mysat6 pulpcore-worker-2: FileNotFoundError: [Errno 2] No such file or directory: ''