Add if else check on state_vector in _new_target function

[mharris-dstl]

No description provided.

[codecov]

Codecov Report

Base: 94.94% // Head: 94.70% // Decreases project coverage by -0.24% ⚠️

Coverage data is based on head (b8afc4b) compared to base (15ede0f).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #755      +/-   ##
==========================================
- Coverage   94.94%   94.70%   -0.25%     
==========================================
  Files         171      174       +3     
  Lines        8464     9193     +729     
  Branches     1233     1411     +178     
==========================================
+ Hits         8036     8706     +670     
- Misses        317      349      +32     
- Partials      111      138      +27     

Flag	Coverage Δ
integration	70.53% <100.00%> (+0.74%)	⬆️
unittests	89.43% <33.33%> (-2.63%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
stonesoup/simulator/simple.py	98.02% <100.00%> (+0.02%)	⬆️
stonesoup/base.py	96.20% <0.00%> (ø)
stonesoup/plotter.py	90.19% <0.00%> (ø)
stonesoup/__init__.py	83.33% <0.00%> (ø)

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