Workaround copyright parsing

When trying to run scan-copyrights on packages like texlive-extra an error arises due to copyright parsing. This issue is already solved in newer version, however, backporting all the required changes represents a bigger tasks with bigger impact of a stable release.

In order to overcome the issue that prevents the CI to pass in pacakges like texlive-extra check that the object exists before trying to consolidate years.

infrastructure/apertis-issues#33 (closed)

Signed-off-by: Walter Lozano walter.lozano@collabora.com