Error when getting license text and information when using `--api_url` and `--api_key` options

[JonoYang]

I am generating an attribution report where I want to get license text and information from an API that provides license information. I am getting this error whenever I use the --api_url and --api_key options.

Command completed with 1 errors or warnings.
ERROR: : 'results'

This looks like a KeyError, but I'm not sure where this is happening.

[JonoYang]

The issue is with this line: https://github.com/nexB/aboutcode-toolkit/blob/develop/src/attributecode/api.py#L63

I've replaced the line with:

if not license_data.get('results', {}):

and reran about attrib and got the following errors:

Command completed with 90 errors or warnings.
ERROR: : Invalid 'license': proprietary-license
ERROR: : Invalid 'license': apache-2.0
ERROR: : Invalid 'license': gpl-2.0
ERROR: : Invalid 'license': bsd-new
ERROR: : Invalid 'license': mit
ERROR: : Invalid 'license': cc-by-3.0
ERROR: : Invalid 'license': lgpl-2.1
ERROR: : Invalid 'license': bsd-simplified
...

[JonoYang]

This error is actually caused by me not using the right API endpoint for license data, but the code should still be updated such that the correct error messages appear.