Fix Bulk Action operation in listener

Steps to reproduce:

• Create an event handler on Folderish documents triggered on the Document Modified event.
• Create the following automation chain, to be launched when the event handler is fired:

  - Context.FetchDocument
  - Bulk.RunAction:
      action: setProperties
      query: expr:SELECT * FROM Document WHERE ecm:ancestorId = @{Document.id}
      parameters: expr:{"dc:description":"@{Document.description}"}
  

Given a folder with thousands of documents in it:

• Modify the description of the folder in Web UI.
  => When clicking Save on edit document dialog:
  • The document is not saved.
  • The edit document dialog remains open.
  • A document.saveError toast notification appears.
  • Errors appear in the server.log (see attached server.log for details).

Caused by: com.fasterxml.jackson.databind.JsonMappingException: Infinite recursion (StackOverflowError)
(through reference chain: org.nuxeo.ecm.core.api.model.impl.DocumentPartImpl["icon-expanded"]
->org.nuxeo.ecm.core.api.model.impl.primitives.StringProperty["parent"]
->org.nuxeo.ecm.core.api.model.impl.DocumentPartImpl["icon-expanded"]
->org.nuxeo.ecm.core.api.model.impl.primitives.StringProperty["parent"]
->org.nuxeo.ecm.core.api.model.impl.DocumentPartImpl["icon-expanded"]
->org.nuxeo.ecm.core.api.model.impl.primitives.StringProperty["parent"]
etc.