WorkflowValidator validate Wrokflow.tojson(workflow) failed

[leo-li1990]

What happened: A Workflow object does not contain the events property，when use Workflow.tojson() generate JSON strings，The strings contains “ errors:[]”. If you use workflowValidator.setSource("WORKFLOW_MODEL_JSON").isValid(), you can get an error massage, such as "msg": "[{"message":"#/errors: expected type: JSONObject, found: JSONArray","type":"schemavalidation"}]"

What you expected to happen: The Json strings do not contain " errors :[]", or validate success

How to reproduce it:

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Environment:

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