RHUI 3 publish task fails with "OError: [Errno 2] No such file or directory: u'/var/lib/pulp/content/units/modulemd"

Issue

• Publish task fails with the following error.

May 25 23:29:49 server-rhua pulp: pulp.server.controllers.repository:ERROR: [7d7d04ba] (12748-83232) Exception caught from plugin during publish for repo [rhel-8-for-x86_64-appstream-rhui-rpms-8]
May 25 23:29:49 server-rhua pulp: pulp.server.controllers.repository:ERROR: [7d7d04ba] (12748-83232) Traceback (most recent call last):
May 25 23:29:49 server-rhua pulp: pulp.server.controllers.repository:ERROR: [7d7d04ba] (12748-83232)   File "/usr/lib/python2.7/site-packages/pulp/server/controllers/repository.py", line 1259, in _do_publish
May 25 23:29:49 server-rhua pulp: pulp.server.controllers.repository:ERROR: [7d7d04ba] (12748-83232)     publish_report = publish_repo(transfer_repo, conduit, call_config)
May 25 23:29:49 server-rhua pulp: pulp.server.controllers.repository:ERROR: [7d7d04ba] (12748-83232)   File "/usr/lib/python2.7/site-packages/pulp/server/async/tasks.py", line 737, in wrap_f
May 25 23:29:49 server-rhua pulp: pulp.server.controllers.repository:ERROR: [7d7d04ba] (12748-83232)     return f(*args, **kwargs)
May 25 23:29:49 server-rhua pulp: pulp.server.controllers.repository:ERROR: [7d7d04ba] (12748-83232)   File "/usr/lib/python2.7/site-packages/pulp_rpm/plugins/distributors/yum/distributor.py", line 174, in publish_repo
May 25 23:29:49 server-rhua pulp: pulp.server.controllers.repository:ERROR: [7d7d04ba] (12748-83232)     return self._publisher.process_lifecycle()
May 25 23:29:49 server-rhua pulp: pulp.server.controllers.repository:ERROR: [7d7d04ba] (12748-83232)   File "/usr/lib/python2.7/site-packages/pulp/plugins/util/publish_step.py", line 572, in process_lifecycle
May 25 23:29:49 server-rhua pulp: pulp.server.controllers.repository:ERROR: [7d7d04ba] (12748-83232)     super(PluginStep, self).process_lifecycle()
May 25 23:29:49 server-rhua pulp: pulp.server.controllers.repository:ERROR: [7d7d04ba] (12748-83232)   File "/usr/lib/python2.7/site-packages/pulp/plugins/util/publish_step.py", line 163, in process_lifecycle
May 25 23:29:49 server-rhua pulp: pulp.server.controllers.repository:ERROR: [7d7d04ba] (12748-83232)     step.process()
May 25 23:29:49 server-rhua pulp: pulp.server.controllers.repository:ERROR: [7d7d04ba] (12748-83232)   File "/usr/lib/python2.7/site-packages/pulp/plugins/util/publish_step.py", line 239, in process
May 25 23:29:49 server-rhua pulp: pulp.server.controllers.repository:ERROR: [7d7d04ba] (12748-83232)     self._process_block(item=item)
May 25 23:29:49 server-rhua pulp: pulp.server.controllers.repository:ERROR: [7d7d04ba] (12748-83232)   File "/usr/lib/python2.7/site-packages/pulp/plugins/util/publish_step.py", line 301, in _process_block
May 25 23:29:49 server-rhua pulp: pulp.server.controllers.repository:ERROR: [7d7d04ba] (12748-83232)     self.process_main(item=item)
May 25 23:29:49 server-rhua pulp: pulp.server.controllers.repository:ERROR: [7d7d04ba] (12748-83232)   File "/usr/lib/python2.7/site-packages/pulp_rpm/plugins/distributors/yum/publish.py", line 878, in process_main
May 25 23:29:49 server-rhua pulp: pulp.server.controllers.repository:ERROR: [7d7d04ba] (12748-83232)     with open(item.storage_path) as fp_in:
May 25 23:29:49 server-rhua pulp: pulp.server.controllers.repository:ERROR: [7d7d04ba] (12748-83232) IOError: [Errno 2] No such file or directory: u'/var/lib/pulp/content/units/modulemd/bd/600ebb2217b5d80a5ff993843ddfda590a2b326c58548c4aebbdb8c044e013'
May 25 23:29:49 server-rhua pulp: pulp.server.async.tasks:INFO: [7d7d04ba] Task failed : [7d7d04ba-6247-4d68-8655-cf36b090c6f7]