Refactoring for constance cli command

[Mogost]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 84.21053% with 3 lines in your changes missing coverage. Please review.

Project coverage is 90.43%. Comparing base (ef24fcb) to head (589821b).
Report is 16 commits behind head on master.

Files	Patch %	Lines
constance/management/commands/constance.py	84.21%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #561      +/-   ##
==========================================
+ Coverage   89.92%   90.43%   +0.50%     
==========================================
  Files          31       31              
  Lines        1032     1087      +55     
  Branches      104      157      +53     
==========================================
+ Hits          928      983      +55     
- Misses         69       70       +1     
+ Partials       35       34       -1     

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