skip price spike check if prices are zero

[dpaiton]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 81.94%. Comparing base (f3b5e9d) to head (4f1e018).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...c/agent0/hyperfuzz/system_fuzz/invariant_checks.py	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1695      +/-   ##
==========================================
+ Coverage   81.56%   81.94%   +0.37%     
==========================================
  Files          99       99              
  Lines        7655     7659       +4     
==========================================
+ Hits         6244     6276      +32     
+ Misses       1411     1383      -28     

Flag	Coverage Δ
unittests	81.94% <50.00%> (+0.37%)	⬆️

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