Deal with build group changes

[msimacek]

Fixes #242

[codecov]

Codecov Report

Merging #243 into master will increase coverage by 0.21%.
The diff coverage is 90.62%.

@@            Coverage Diff             @@
##           master     #243      +/-   ##
==========================================
+ Coverage   82.34%   82.55%   +0.21%     
==========================================
  Files          41       41              
  Lines        3341     3354      +13     
==========================================
+ Hits         2751     2769      +18     
+ Misses        590      585       -5

Impacted Files	Coverage Δ
...gins/copr_plugin/backend/services/copr_resolver.py	80.95% <ø> (ø)	⬆️
koschei/backend/services/repo_resolver.py	90.32% <100%> (+0.06%)	⬆️
koschei/backend/services/resolver.py	96.74% <100%> (ø)	⬆️
koschei/backend/services/build_resolver.py	91.11% <100%> (+6.4%)	⬆️
koschei/backend/koji_util.py	69.51% <72.72%> (+1.35%)	⬆️

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[msimacek]

The function has no test, I need to add one

[mizdebsk]

Everything looks good, tests pass.