Update usage of isfinite() in Armadillo

[astamm]

No description provided.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 82.14286% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.95%. Comparing base (eac3dd9) to head (a2882a0).
⚠️ Report is 20 commits behind head on master.

Files with missing lines	Patch %	Lines
R/fdadbscan.R	60.00%	6 Missing ⚠️
R/fdahclust.R	50.00%	6 Missing ⚠️
R/fdadist.R	94.11%	3 Missing ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #18      +/-   ##
==========================================
- Coverage   77.70%   76.95%   -0.76%     
==========================================
  Files          38       38              
  Lines        2247     2256       +9     
==========================================
- Hits         1746     1736      -10     
- Misses        501      520      +19     

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