Fix NRE thrown from SecurityAmount.RoundedAmount

[AArnott]

When the struct is uninitialized, NRE can be thrown from the property. Granted, folks shouldn't be using uninitialized values.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (68a0705) 75.23% compared to head (a08b337) 75.24%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #177   +/-   ##
=======================================
  Coverage   75.23%   75.24%           
=======================================
  Files         155      155           
  Lines        9070     9072    +2     
  Branches      835      836    +1     
=======================================
+ Hits         6824     6826    +2     
  Misses       2045     2045           
  Partials      201      201           

Flag	Coverage Δ
LinuxHost	75.24% <100.00%> (+<0.01%)	⬆️
Release	75.24% <100.00%> (+<0.01%)	⬆️
WindowsHost	75.24% <100.00%> (+<0.01%)	⬆️
macOSHost	75.24% <100.00%> (+<0.01%)	⬆️

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