This commit also includes:
- whitespace / code formatting fixes
- slight syntax related changes: except <exception_name>, e -> except <exception_name> as e
- 3 pointless instructions instances have been rewritten [sorted] (spotted by semi-automatic check)
The unrelated changes shouldn't have any real impact on whipper's behaviour.
* Use artist-credit->name
Use artist-credit->name, if it exists. Otherwise use artist-credit->artist->name.
* Add test case
* Fix for PEP8
* transform comment to docstring
* reject 'recording artist name' in favour of 'release artist name'
* reject 'recording artist name' in favour of 'release artist name'
