Cover case when run mure refresh in not git repsoitory

[kitsuyui]

Close: #22

[codecov-commenter]

Codecov Report

Base: 71.71% // Head: 72.15% // Increases project coverage by +0.43% 🎉

Coverage data is based on head (e27a337) compared to base (ea54edc).
Patch coverage: 94.11% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #46      +/-   ##
==========================================
+ Coverage   71.71%   72.15%   +0.43%     
==========================================
  Files          12       12              
  Lines         852      869      +17     
==========================================
+ Hits          611      627      +16     
- Misses        241      242       +1     

Flag	Coverage Δ
unittests	72.15% <94.11%> (+0.43%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/app/refresh/mod.rs	57.37% <94.11%> (+14.19%)	⬆️

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