handle: Do not free temporary error msg if there is no one (RhBug: 1219822)
handle: Do not free temporary error msg if there is no one (RhBug: 1219822)

bgamari/librepo,rpm-software-management/librepo,Tojaj/librepo,rholy/librepo,bgamari/librepo,rholy/librepo,rholy/librepo,Conan-Kudo/librepo,bgamari/librepo,rpm-software-management/librepo,Conan-Kudo/librepo,rpm-software-management/librepo,rholy/librepo,Conan-Kudo/librepo,Tojaj/librepo,Tojaj/librepo