fix(load): handle GPU without model

Author: rezib

firehpc/load.py

@@ -158,7 +158,7 @@ def _get_partition_gpus(self, partition):
                     gres = gres.split(":")
                     if gres[0] != "gpu":
                         continue
-                    result += int(gres[2])
+                    result += int(gres[-1])
         except json.decoder.JSONDecodeError as err:
             raise FireHPCRuntimeError(
                 f"Unable to retrieve nodes from cluster {self.cluster.name}: {str(err)}"