Resolved some warnings and style issues

marl_factory_grid/modules/clean_up/entitites.py

@@ -1,5 +1,3 @@
-from numpy import random
-
 from marl_factory_grid.environment.entity.entity import Entity
 from marl_factory_grid.utils.utility_classes import RenderEntity
 from marl_factory_grid.modules.clean_up import constants as d

marl_factory_grid/modules/clean_up/groups.py

@@ -1,9 +1,7 @@
-from typing import Union, List, Tuple
-
 from marl_factory_grid.environment import constants as c
-from marl_factory_grid.utils.results import Result
 from marl_factory_grid.environment.groups.collection import Collection
 from marl_factory_grid.modules.clean_up.entitites import DirtPile
+from marl_factory_grid.utils.results import Result
 
 
 class DirtPiles(Collection):

marl_factory_grid/modules/clean_up/rules.py

@@ -49,7 +49,7 @@ class RespawnDirt(Rule):
     def tick_step(self, state):
         collection = state[d.DIRT]
         if self._next_dirt_spawn < 0:
-            pass  # No DirtPile Spawn
+            result = []  # No DirtPile Spawn
         elif not self._next_dirt_spawn:
             result = [collection.trigger_spawn(state, coords_or_quantity=self.respawn_n, amount=self.respawn_amount)]
             self._next_dirt_spawn = self.respawn_freq