fix: Don't add episode to DB if they failed downloading (#209)

[janw]

Fixes #209.

[codecov]

Codecov Report

Attention: Patch coverage is 95.12195% with 2 lines in your changes missing coverage. Please review.

Project coverage is 91.06%. Comparing base (8f4ae3c) to head (befbac6).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
podcast_archiver/processor.py	94.87%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #210      +/-   ##
==========================================
+ Coverage   90.75%   91.06%   +0.31%     
==========================================
  Files          15       15              
  Lines         865      873       +8     
  Branches      160      160              
==========================================
+ Hits          785      795      +10     
+ Misses         55       54       -1     
+ Partials       25       24       -1     

Files with missing lines	Coverage Δ
podcast_archiver/types.py	90.00% <100.00%> (+1.11%)	⬆️
podcast_archiver/processor.py	92.78% <94.87%> (+2.78%)	⬆️

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