fix: ignore NaN points on pdf export

[arpandaze]

While converting points to SVG path, the condition where dx and dy values of points are NaN isn't checked. So path returned by toSvgPath() becomes something like MNanNaNLNaNNaN which is invalid.This is the reason why PDF exports are failing. I have fixed that by filtering out NaN values.

Closes #1026
Closes #1125

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 37.30%. Comparing base (986f5e8) to head (efd2f82).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1135      +/-   ##
==========================================
- Coverage   37.37%   37.30%   -0.08%     
==========================================
  Files         108      108              
  Lines        8497     8497              
==========================================
- Hits         3176     3170       -6     
- Misses       5321     5327       +6     

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[adil192]

Thank you!