Bug fixes

[uniqueg]

Description

• fix pydantic's validation of classes depending on enumerators with None values by explicitly allowing None instead of the enumerator class (workaround for reported bug in Pydantic: https://github.com/samuelcolvin/pydantic/issues/3049)
• fix double assignment of same file to both first and second mate in modules htsinfer.get_library_source and htsinfer.get_library_stats

[codecov-commenter]

Codecov Report

Merging #88 (d1e5f36) into dev (3901673) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##               dev       #88   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           10        10           
  Lines          611       611           
=========================================
  Hits           611       611           

Impacted Files	Coverage Δ
htsinfer/get_library_stats.py	100.00% <ø> (ø)
htsinfer/models.py	100.00% <100.00%> (ø)

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