get_delta_from_evr(): create the python object only when delta exists
get_delta_from_evr(): create the python object only when delta exists

rpm-software-management/libhif,edynox/libdnf,cgwalters/libhif,cgwalters/libhif,hughsie/libhif,hughsie/libhif,Conan-Kudo/libhif,cgwalters/libhif,rpm-software-management/libdnf,rpm-software-management/libdnf,rpm-software-management/libdnf,rpm-software-management/libhif,edynox/libdnf,Conan-Kudo/libhif,edynox/libdnf,rpm-software-management/libhif,hughsie/libhif,edynox/libdnf,Conan-Kudo/libhif,hughsie/libhif,cgwalters/libhif,rpm-software-management/libdnf,rpm-software-management/libhif,Conan-Kudo/libhif