Fixed variable name error

item_dist.py

@@ -309,7 +309,7 @@ def add_chest_reward(raffle, chest):
 
     if obj is not None:
         to_add = copy.deepcopy(obj)
-        
+
     chest.contains = to_add
 
 def evaluate_spawn(obj, room, probability):
@@ -344,7 +344,7 @@ def populate_rooms():
     possible_rewards = []
 
     # Add the nothing
-    possible_reward += [None] * CHANCE_NOTHING
+    possible_rewards += [None] * CHANCE_NOTHING
 
     for category in spawnable_items:
         for item in spawnable_items[category]: