Improve _verify_session

[hmpf]

Closes #69

[codecov]

Codecov Report

Attention: Patch coverage is 44.44444% with 5 lines in your changes missing coverage. Please review.

Project coverage is 70.35%. Comparing base (970cc68) to head (a489f74).

Files	Patch %	Lines
src/zinolib/controllers/zino1.py	44.44%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #70      +/-   ##
==========================================
+ Coverage   70.23%   70.35%   +0.12%     
==========================================
  Files          13       13              
  Lines        1458     1464       +6     
==========================================
+ Hits         1024     1030       +6     
  Misses        434      434              

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