(bug 44336) Don't show invalid license wrongly

Sometimes flickr returns an error msg (as in when the content is
restricted and needs authentication), in such cases UW shouldn't show
'invalid license'.. Better messages need to be shown but currently lets
just show invalid URL.

Change-Id: I193e15d15be1efa4dc89af0046e467a327557cec
TODO: How to handle error codes from flickr?
Merge "(bug 44336) Don't show invalid license wrongly"