Ignore NaNs by deafault in sample1d. Let lowess work with NaNs.

[joa-quim]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 79.31034% with 6 lines in your changes missing coverage. Please review.

Please upload report for BASE (master@e34b130). Learn more about missing BASE report.
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/utils.jl	25.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1704   +/-   ##
=========================================
  Coverage          ?   84.82%           
=========================================
  Files             ?      166           
  Lines             ?    23310           
  Branches          ?        0           
=========================================
  Hits              ?    19772           
  Misses            ?     3538           
  Partials          ?        0           

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