NullPointer Exception when publishing Virtual Agent TopicsIssue When attempting to publish a topic in Virtual Agent Designer, might encounter a java.lang.NullPointerException error. Check the browser's network tab to see an error related to the /api/now/v1/va/publish endpoint.CauseThe topic contains field mappings that are empty. An example of this is when the "Add field" button is clicked but no fields are mapped. ResolutionTo fix the problem, delete the empty field mappings and then publish the topic again