test: Cover remaining lines of upgradedb

[Martchus]

Related ticket: https://progress.opensuse.org/issues/198158

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.97%. Comparing base (e9cf264) to head (6ff585a).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7254      +/-   ##
==========================================
+ Coverage   99.95%   99.97%   +0.02%     
==========================================
  Files         420      420              
  Lines       44038    44036       -2     
==========================================
+ Hits        44016    44023       +7     
+ Misses         22       13       -9     

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