provide a breadcrumb when spline interpolation fails during profiling

[palday]

closes #794

[codecov]

Codecov Report

❌ Patch coverage is 54.54545% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.41%. Comparing base (04d96b4) to head (1c4889f).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/profile/sigmapr.jl	50.00%	3 Missing ⚠️
src/profile/vcpr.jl	60.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #857      +/-   ##
==========================================
- Coverage   95.54%   95.41%   -0.13%     
==========================================
  Files          38       38              
  Lines        3703     3710       +7     
==========================================
+ Hits         3538     3540       +2     
- Misses        165      170       +5     

Flag	Coverage Δ
current	95.09% <54.54%> (-0.13%)	⬇️
minimum	95.41% <54.54%> (-0.13%)	⬇️

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