[DF] Remove useless protection against vector<bool>
[DF] Remove useless protection against vector<bool>

Value types of variations are always RVecs.

olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root