Fix warning generated in SDV: Synthesizer Sequences (PAR) demo

[fealho]

CU-86b2u95uk, Resolve #2286.

[sdv-team]

Task linked: CU-86b2u95uk SDV - Pandas FutureWarning: The behavior of DataFrame concatenation with empty or all-NA entries is deprecated... #2286

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.58%. Comparing base (faeef89) to head (8ca79c8).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2319   +/-   ##
=======================================
  Coverage   98.58%   98.58%           
=======================================
  Files          58       58           
  Lines        6078     6078           
=======================================
  Hits         5992     5992           
  Misses         86       86           

Flag	Coverage Δ
integration	82.24% <100.00%> (ø)
unit	97.41% <100.00%> (ø)

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