Comment 2 for bug 1648000

Here's a reproducer using lp-shell instead of wget:

>>> lp.load('ubuntu/+archive/primary').getPublishedSources(pocket='Proposed', source_name='lib', distro_series='/ubuntu/zesty')[0].packageupload
>>>

Expected return value: A package_upload object
Actual return value: None

This happens on every source_package_publishing_history, without exception.