update execute_sequence to account for epsilon

Author: emuskardin

aalpy/base/Automaton.py

@@ -143,6 +143,9 @@ def make_input_complete(self, missing_transition_go_to='self_loop'):
         make_input_complete(self, missing_transition_go_to)
 
     def execute_sequence(self, origin_state, seq):
+        # to account epsilon in DFAs, Moore, MDPs machines
+        if not seq:
+            return origin_state.output
         self.current_state = origin_state
         return [self.step(s) for s in seq]