Handle exception for get device API when a device is not found

[kushanb]

Description:

The server throws an exception when polled to check if the device to be registered has got added to the database causing the exception to be thrown multiple times in the server with the full stack trace. The API returns 500 Internal server error

Handle the exception from the API component and return a 404 HTTP status code for the API call to indicate that the device is not found.