fix(dashboard): missing null check in error extra

[justinpark]

SUMMARY

As titled, this commit includes a null check for the extra value.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

Before:

TESTING INSTRUCTIONS

Specs are included

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.41%. Comparing base (38eecfc) to head (70914e2).
Report is 41 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #27845      +/-   ##
==========================================
- Coverage   67.47%   67.41%   -0.07%     
==========================================
  Files        1911     1919       +8     
  Lines       75020    75207     +187     
  Branches     8355     8423      +68     
==========================================
+ Hits        50621    50701      +80     
- Misses      22349    22446      +97     
- Partials     2050     2060      +10     

Flag	Coverage Δ
javascript	57.40% <ø> (-0.08%)	⬇️

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