GitLab

* librariesindex: Fix nil pointer. Refs #1176

Let the library index return the latest known version,
if a library without a version is found.
Signed-off-by: Ruben Jenster <r.jenster@drachenfels.de>

* Remove logging statement from FindLibraryUpdate.
Signed-off-by: Ruben Jenster <r.jenster@drachenfels.de>

* Add a small comment to the lib.Version nil check.
Signed-off-by: Ruben Jenster <r.jenster@drachenfels.de>

* Fix some commands failing when an installed library has invalid version

* [skip changelog] Add integration tests
Co-authored-by: Ruben Jenster <r.jenster@drachenfels.de>