Kevin Locke 3ec17dbd33 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 <kevin@kevinlocke.name>

2020-01-29 12:35:49 +00:00

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