Null "triggerTime" field in processinstance events leads to management console crash

### request
{
  ProcessInstances(
    where: {
      state: {
        equal: ACTIVE}
    }, 
    orderBy: {
      start: DESC}, 
    pagination: {
      limit: 10, 
      offset: 0}) {
    id
    processId
    processName
    start
    end
    state
    nodes {
      id, name, type, exit, enter
    }
    variables
  }
}

### response

{
    "id": "1913510b-a4e6-4080-9630-c473d5d0d2ca",
    "source": "http://localhost:8080/test",
    "type": "ProcessInstanceEvent",
    "time": "2022-07-21T11:48:55.232915Z",
    "data": {
        "id": "41f8f589-608e-4dd0-86f6-2653e9f135be",
        "version": "1.0",
        "parentInstanceId": "",
        "rootInstanceId": "",
        "processId": "test",
        "processType": null,
        "rootProcessId": "",
        "processName": "test",
        "startDate": "2022-07-21T11:48:38.695+00:00",
        "endDate": null,
        "state": 1,
        "businessKey": "",
        "nodeInstances": [
            {
                "id": "1bbc4c2a-a9d6-461d-ba03-cde40d26d38e",
                "nodeId": "11",
                "nodeDefinitionId": "_13036128-58AA-47EC-A807-7304392621ED",
                "nodeName": "Timer",
                "nodeType": "TimerNode",
                "triggerTime": "2022-07-21T11:48:55.200+00:00",
                "leaveTime": null
            },
            {
                "id": "3cd512c8-58a0-4419-ad1e-2e74168cb7ab",
                "nodeId": "9",
                "nodeDefinitionId": "_D0C9599D-34CB-47F6-BD91-FE752088CD17",
                "nodeName": "Usertask",
                "nodeType": "HumanTaskNode",
################ triggerTime is null #################3
                "triggerTime": null,
                "leaveTime": "2022-07-21T11:48:55.200+00:00"
            }
        ],
        "variables": {
            "main": "string"
        },
        "error": null,
        "roles": null,
        "milestones": []
    },
    "specversion": "1.0",
    "kogitoprocinstanceid": "41f8f589-608e-4dd0-86f6-2653e9f135be",
    "kogitoprocid": "test",
    "kogitoaddons": "mongodb-persistence,process-management,monitoring,process-svg,prometheus-monitoring,jobs-management",
    "kogitoprocversion": "1.0",
    "kogitousertaskist": "1"
} 

    {      "_id": "3cd512c8-58a0-4419-ad1e-2e74168cb7ab",      "definitionId": "_D0C9599D-34CB-47F6-BD91-FE752088CD17",      "exit": 1658404135200,      "name": "Usertask",      "nodeId": "9",      "type": "HumanTaskNode"    }, 

{
  "errors": [
    {
      "message": "The field at path '/ProcessInstances[0]/nodes[1]/enter' was declared as a non null type, but the code involved in retrieving data has wrongly returned a null value.  The graphql specification requires that the parent field be set to null, or if that is non nullable that it bubble up null to its parent and so on. The non-nullable type is 'DateTime' within parent type 'NodeInstance'",
      "path": [
        "ProcessInstances",
        0,
        "nodes",
        1,
        "enter"
      ],
      "extensions": {
        "classification": "NullValueInNonNullableField"
      }
    }
  ],
  "data": {
    "ProcessInstances": [
      null
    ]
  }
} 

mvn clean package
docker-compose build
docker-compose up -d

curl -X 'POST' \
  'http://localhost:8080/test' \
  -H 'accept: */*' \
  -H 'Content-Type: application/json' \
  -d '{
  "main": "string"
}'