Handle no Reference Electrode

[samuelbray32]

Fixes #126

• in add electrode groups, assign ref_elect_id = -1 in the electrodes table in cases where the reference was not used
• add test for this case

[Copilot]

Pull Request Overview

This PR fixes handling of cases where no reference electrode is specified for electrode groups. The change modifies the add_electrode_groups function to assign ref_elect_id = -1 when no reference electrode is used, addressing issue #126.

• Adds logic to handle reference electrode map entries with "-1" indicating no reference
• Includes test coverage for the no-reference electrode scenario

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
src/trodes_to_nwb/convert_yaml.py	Adds conditional logic to handle "-1" reference electrode case
src/trodes_to_nwb/tests/test_convert_yaml.py	Adds test function to verify no-reference electrode behavior

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.52%. Comparing base (883a2a4) to head (777da04).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #127      +/-   ##
==========================================
+ Coverage   89.50%   89.52%   +0.01%     
==========================================
  Files          13       13              
  Lines        1686     1689       +3     
==========================================
+ Hits         1509     1512       +3     
  Misses        177      177              

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