refactor: simplify code in module importer

[postironix]

improved cyclomatic difficulty from level C to level A in importer.py exit (checked with radon)

[JoanFM]

Hey @BouFFaNTCRiB ,

Could you have a detailed explanation of what is being fixed here? Is there any test that can be added?

[codecov]

Codecov Report

Attention: 9 lines in your changes are missing coverage. Please review.

Comparison is base (8cea02a) 76.80% compared to head (f9619dd) 76.84%.
Report is 6 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6077      +/-   ##
==========================================
+ Coverage   76.80%   76.84%   +0.04%     
==========================================
  Files         145      145              
  Lines       13989    14005      +16     
==========================================
+ Hits        10744    10762      +18     
+ Misses       3245     3243       -2     

Flag	Coverage Δ
jina	76.84% <82.00%> (+0.04%)	⬆️

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

Files	Coverage Δ
jina/importer.py	89.32% <82.00%> (+1.96%)	⬆️

... and 1 file with indirect coverage changes

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