Avoid calling extrema(...; dims) with empty arrays. See PR #1711

[joa-quim]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 80.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 85.90%. Comparing base (1f3ac2a) to head (f766ac7).

Files with missing lines	Patch %	Lines
src/extras/lowess.jl	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1713      +/-   ##
==========================================
+ Coverage   85.75%   85.90%   +0.15%     
==========================================
  Files         167      167              
  Lines       23363    23377      +14     
==========================================
+ Hits        20034    20083      +49     
+ Misses       3329     3294      -35     

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