testMediaCard passes for unknown licenses
testMediaCard passes for unknown licenses

We modified the license-serving API to account for unknown licenses. Now, we
get the "Unknown license" string in those cases. That means that the test
that checks for unsensitive labels for unknown licenses has to be adjusted.

In addition, I created a helper method to reuse some code.

[endlessm/eos-sdk#3568]

endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib