Fix a possible but unlikely crash in sctscan util

[Martin2112]

Can currently try to log something not guarded by a nil check.

Checklist

• I have updated the CHANGELOG.
  • Adjust the draft version number according to semantic versioning rules.
• I have updated documentation accordingly.

[codecov]

Codecov Report

Merging #592 into master will decrease coverage by 0.13%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #592      +/-   ##
==========================================
- Coverage   71.82%   71.68%   -0.14%     
==========================================
  Files          90       90              
  Lines        9791     9737      -54     
==========================================
- Hits         7032     6980      -52     
  Misses       2265     2265              
+ Partials      494      492       -2

Impacted Files	Coverage Δ
ctpolicy/ctpolicy.go	34.37% <0%> (-7.3%)	⬇️
ctpolicy/applepolicy.go	77.77% <0%> (-4.58%)	⬇️
submission/races.go	81.67% <0%> (-3.06%)	⬇️
scanner/scanner.go	55.41% <0%> (-1.28%)	⬇️
submission/distributor.go	83.55% <0%> (+0.1%)	⬆️
ctpolicy/chromepolicy.go	79.31% <0%> (+0.73%)	⬆️

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