"preview_url" is null if I search for the track when I use the webAPI if I use client credentials as a authorization.

[vggoli]

Issue found on February 19th 2015.

Endpoint(s):

• GET /v1/tracks/11dFghVXANMlKmJXsNCbNl

Scope(s):

*Authentication using client credentials.

Steps to reproduce:

1. Requested data from the webAPi about the tracks.

Expected behaviour:

Preview_url should not be null.

Actual behaviour:

preview_url is null.