repo: handle deb package fetch error

[cmatsuoka]

End gracefully instead of crashing if a deb package can't be
fetched.

Fixes SNAPCRAFT-JE
Fixes SNAPCRAFT-JF

Signed-off-by: Claudio Matsuoka claudio.matsuoka@canonical.com

• Have you followed the guidelines for contributing?
• Have you signed the CLA?
• Have you successfully run ./runtests.sh static?
• Have you successfully run ./runtests.sh tests/unit?

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[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@46e3d17). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master    #2513   +/-   ##
=========================================
  Coverage          ?   89.92%           
=========================================
  Files             ?      198           
  Lines             ?    13382           
  Branches          ?     2025           
=========================================
  Hits              ?    12034           
  Misses            ?      923           
  Partials          ?      425

Impacted Files	Coverage Δ
snapcraft/internal/repo/_deb.py	74.22% <100%> (ø)
snapcraft/internal/repo/errors.py	83.13% <100%> (ø)

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[sergiusens]

Thanks, looks good, mind updating the copyright years though?

[cmatsuoka]

Copyright notice dates updated. Good catch, it's quite easy to forget to update those.