Pr/pt file import bugfix

[gefux]

Fixes #73

• The contribution has been discussed and agreed on in the Issue section.
• Code contributions do its best to follow the zen of python.
• The automated test are all positive:
  • tox -e py36 (to run pytest) the code tests.
  • tox -e style (to run pylint) the code style tests.
  • tox -e docs (to run sphinx) generate the documentation.
• Added test for changed/added code.

[codecov-commenter]

Codecov Report

Base: 89.43% // Head: 89.64% // Increases project coverage by +0.21% 🎉

Coverage data is based on head (dfb2c18) compared to base (be1c8bc).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #74      +/-   ##
==========================================
+ Coverage   89.43%   89.64%   +0.21%     
==========================================
  Files          24       24              
  Lines        3709     3709              
==========================================
+ Hits         3317     3325       +8     
+ Misses        392      384       -8     

Impacted Files	Coverage Δ
oqupy/process_tensor.py	82.55% <100.00%> (+2.08%)	⬆️

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