REST API > Querying for image of an informationmodel returns 500 in the response code

[deepagithub]

Steps:
From http://vorto.eclipse.org/#/api, Choose the REST API to GET image of a vorto model, that does not have an image.
e.g.
GET http://vorto.eclipse.org//rest/model/image/devices/TISensorTag/1.0.0
Expected Result:
Response Code should be 404
Actual Result:
Response Code is 500 - Internal Server Error