repos: Don't error out for missing treeinfo files
repos: Don't error out for missing treeinfo files

Just silently ignore mount points that don't have a .treeinfo file.

https://bugzilla.redhat.com/show_bug.cgi?id=1114207

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