add None return for peak_times in calculate_feature() of extraFELFeature class

[darshanmandge]

To return None when the peak_times is None in calculate_feature function of extraFELFeature.

[AurelienJaquier]

@alejoe91 I'm pinging you to let you know we are making this change related to LFPy efeature

[alejoe91]

Thanks! Sounds fair :)

[codecov-commenter]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (6aa8937) 87.41% compared to head (12a4df9) 86.13%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #472      +/-   ##
==========================================
- Coverage   87.41%   86.13%   -1.28%     
==========================================
  Files          50       50              
  Lines        4330     4336       +6     
==========================================
- Hits         3785     3735      -50     
- Misses        545      601      +56     

Files	Coverage Δ
bluepyopt/ephys/efeatures.py	83.98% <14.28%> (-1.47%)	⬇️

... and 5 files with indirect coverage changes

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