Merge pull request #198 from FalkorDB/197-error-not-supported-between…

…-instances-of-int-and-nonetype

filter out nodes without idx, eg: no hostname

falkordb-cluster-rebalance/src/falkordb_cluster.py

@@ -103,6 +103,7 @@ def _refresh(self) -> "FalkorDBCluster":
             FalkorDBClusterNode.from_dict(key, val)
             for key, val in self.client.cluster_nodes().items()
         ]
+        self.nodes = [node for node in self.nodes if node.idx is not None]
         self.sort()
         logging.info(f"{datetime.now()}: Cluster refreshed: {self}")
         return self