ci: Do not set source_wip to empty
Test results are now correctly reported: https://lavaphabbridge.apertis.org/report/v2023dev1/20220221.1502/nfs (from pipeline https://gitlab.apertis.org/infrastructure/apertis-lava-recipes/-/pipelines/345007)
Test results are now correctly reported: https://lavaphabbridge.apertis.org/report/v2023dev1/20220221.1502/nfs (from pipeline https://gitlab.apertis.org/infrastructure/apertis-lava-recipes/-/pipelines/345007)