sylvactl inventory nil pointer deference

This was observed in https://gitlab.com/sylva-projects/sylva-core/-/jobs/14148962532

This regression was introduced in !544 (merged)

It is caused by latest that evaluates to nil here: https://gitlab.com/sylva-projects/sylva-elements/sylvactl/-/blob/903274c9c3529c47b1287983ebaa0351df979837/internal/inventory/inventory.go#L254