goal solutions: test for hy_goal_get_solution()
goal solutions: test for hy_goal_get_solution()

Closes: #177
Approved by: ignatenkobrain

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