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-devel and -python have the dependency on main package and that depends on the libs package, so in theory there is no bug. But rpmdiff does not like it, so lets add the explicit dependency, which should make rpmdiff happy and transitively me happy as well (or at least happier).
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://rhn.redhat.com/errata/RHBA-2016-2216.html