fix joblist bug

ml/ml40/features/properties/values/documents/jobs/job_list.py

@@ -20,5 +20,7 @@ def jobs(self, value):
     def to_json(self):
         self.__json_out = super().to_json()
         if self.jobs:
-            self.__json_out["jobs"] = self.jobs
+            self.__json_out["jobs"] = list()
+        for job in self.jobs:
+            self.__json_out["jobs"].append(job.to_json())
         return self.__json_out
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