Use empty() to resolve readability-container-size-empty

[vil02]

This PR resolved the readability-container-size-empty warning.

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[codecov]

Codecov Report

❌ Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 97.04%. Comparing base (030b836) to head (32bd1e1).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
include/CXXGraph/Graph/Algorithm/Dijkstra_impl.hpp	75.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #545   +/-   ##
=======================================
  Coverage   97.04%   97.04%           
=======================================
  Files          97       97           
  Lines       11573    11573           
  Branches      772      772           
=======================================
  Hits        11231    11231           
  Misses        342      342           

Flag	Coverage Δ
unittests	97.04% <83.33%> (ø)

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