Fix mapping for Zaak->eigenschappen to Request->body

Installation/Mapping/zaakToRequest.mapping.json

@@ -14,7 +14,7 @@
     "status": "received",
     "type": "{{ '/api/request_types/' ~ embedded.zaaktype.identificatie }}",
     "customers": "{% if embedded is defined and embedded.rollen is defined %}{{ map(\"https://commongateway.nl/mapping/RolToCustomer.mapping.json\", embedded.rollen, true)|json_encode }}{% else %}[]{% endif %}",
-    "body": "{% if embedded is defined and embedded.eigenschappen is defined %}[{% for eigenschap in embedded.eigenschappen %}{% if loop.first == false %},{% endif %}\"{{ eigenschap.embedded.eigenschap.naam }}\":\"{{ eigenschap.waarde }}\"{% endfor %}]{% else %}[]{% endif %}",
+    "body": "{% if embedded is defined and embedded.eigenschappen is defined %}{% set array = {} %}{% for eigenschap in embedded.eigenschappen %}{% set array = array|merge({(eigenschap.embedded.eigenschap.naam): eigenschap.waarde}) %}{% endfor %}{{ array|json_encode }}{% else %}[]{% endif %}",
     "documents": "{% if embedded is defined and embedded.zaakinformatieobjecten is defined %}[{% for zaakinformatieobject in embedded.zaakinformatieobjecten %}{% if loop.first == false %},{% endif %}{\"file\":\"zaakinformatieobject.informatieobject.inhoud\"}{% endfor %}]{% else %}[]{% endif %}"
   },
   "cast": {