set value for nodes_raw to avoid regression issue

lisa/schema.py

@@ -1155,6 +1155,8 @@ class Environment:
 
         if self.nodes_raw:
             for node_raw in self.nodes_raw:
+                if not isinstance(node_raw, dict):
+                    node_raw = node_raw.to_dict()
                 node_type = node_raw[constants.TYPE]
                 if node_type == constants.ENVIRONMENTS_NODES_REQUIREMENT:
                     original_req: NodeSpace = load_by_type(NodeSpace, node_raw)

lisa/sut_orchestrator/azure/common.py

@@ -1042,12 +1042,14 @@ def load_environment(
 
     # create mock environment from environments
     environment_runbook = schema.Environment()
+    if environment_runbook.nodes_raw is None:
+        environment_runbook.nodes_raw = []
 
     compute_client = get_compute_client(platform)
     vms = compute_client.virtual_machines.list(resource_group_name)
     for vm in vms:
         node_schema = schema.RemoteNode(name=vm.name)
-        environment_runbook.nodes.append(node_schema)
+        environment_runbook.nodes_raw.append(node_schema)
 
     environments = load_environments(
         schema.EnvironmentRoot(environments=[environment_runbook])