[GROW-2938] prevent get_node_from_slot from failing due to concurrent cluster slots refresh

Author: zach-iee

redis/cluster.py

@@ -1396,7 +1396,10 @@ def get_node_from_slot(self, slot, read_from_replicas=False, server_type=None):
             # randomly choose one of the replicas
             node_idx = random.randint(1, len(self.slots_cache[slot]) - 1)
 
-        return self.slots_cache[slot][node_idx]
+        try:
+            return self.slots_cache[slot][node_idx]
+        except IndexError:
+            return self.slots_cache[slot][0]
 
     def get_nodes_by_server_type(self, server_type):
         """