Merge pull request #751 from bnussman/make-event-username-nullable

Make `Event` `username` Nullable

Author: bbiggerr

openapi.yaml

@@ -21529,6 +21529,7 @@ components:
         username:
           type: string
           readOnly: true
+          nullable: true
           description: >
             The username of the User who caused the Event.
           example: exampleUser