Fixed a tiny typo in the RuntimeException message.
Fixed a tiny typo in the RuntimeException message.

mizdebsk/hawkey,rpm-software-management/hawkey,mizdebsk/hawkey,megaumi/hawkey,Conan-Kudo/hawkey,mizdebsk/hawkey,megaumi/hawkey,megaumi/hawkey,rpm-software-management/hawkey,rpm-software-management/hawkey,Conan-Kudo/hawkey,megaumi/hawkey,rpm-software-management/hawkey,Conan-Kudo/hawkey,Conan-Kudo/hawkey,mizdebsk/hawkey