cmd: IdentifyDistro returns a distro object which can be nil
cmd: IdentifyDistro returns a distro object which can be nil

Signed-off-by: Alfredo Deza <3f4d00ffa77e6441ab2d23c25a618925d2383b02@anchore.com>

anchore/syft,anchore/syft,anchore/syft,anchore/syft,anchore/syft,anchore/syft,anchore/syft