Minor bugfixes

ensemble_md/cli/run_REXEE.py

@@ -248,7 +248,7 @@ def main():
                 # Note we use states (copy of states_) instead of states_ in update_MDP.
                 for j in list(range(REXEE.n_sim)):
                     os.mkdir(f'{REXEE.working_dir}/sim_{j}/iteration_{i}')
-                    if self.fixed_weights is True:
+                    if REXEE.fixed_weights is True:
                         counts = None    # So that this should work also for GROMACS version < 2022.5
                     MDP = REXEE.update_MDP(f"sim_{j}/iteration_{i - 1}/expanded.mdp", j, i, states, wl_delta, weights, counts)   # modify with a new template  # noqa: E501
                     MDP.write(f"{REXEE.working_dir}/sim_{j}/iteration_{i}/expanded.mdp", skipempty=True)