Commits on Jan 29, 2020

1. Fix crash fetching cover art for unknown album …

   Ripping an unknown album when cover art fetching is enabled (e.g.
   `whipper cd rip --unknown --cover-art complete`) causes whipper to crash
   with an error similar to the following:
   
   ```python
   Traceback (most recent call last):
       File "<string>", line 1, in <module>
       File ".../whipper/whipper/command/main.py", line 43, in main
       ret = cmd.do()
       File ".../whipper/whipper/command/basecommand.py", line 139, in do
       return self.cmd.do()
       File ".../whipper/whipper/command/basecommand.py", line 139, in do
       return self.cmd.do()
       File ".../whipper/whipper/command/cd.py", line 191, in do
       self.doCommand()
       File ".../whipper/whipper/command/cd.py", line 363, in doCommand
       self.program.metadata.mbid)
   AttributeError: 'NoneType' object has no attribute 'mbid'
   ```
   
   due to accessing `self.program.metadata.mbid` when
   `self.program.metadata` is `None`. To avoid this, only attempt to get
   cover art when `self.program.metadata` is available.
   
   Also print a warning when the cover art can't be fetched to inform the
   user that it isn't being downloaded.
   
   Signed-off-by: Kevin Locke <[email protected]>

   

   kevinoid authored and JoeLametta committed Jan 29, 2020
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