cgit/lister: Fix error when a missing version is not provided
(no test added yet, don't know if it's that much required)
Related to [1]
Test Plan
tox
Migrated from D5794 (view on Phabricator)
(no test added yet, don't know if it's that much required)
Related to [1]
tox
Migrated from D5794 (view on Phabricator)