base: Filter out empty URIs so PyLD does not crash
Resolves https://sentry.softwareheritage.org/share/issue/af94bbb7438648239ac9a2f769dc7ec0/
Migrated from D8372 (view on Phabricator)
Staging instance, all changes can be removed at any time
Resolves https://sentry.softwareheritage.org/share/issue/af94bbb7438648239ac9a2f769dc7ec0/
Migrated from D8372 (view on Phabricator)