#3385: Use default theme logo when not found

[fregante]

What does this PR do?

• Fixes Extension is broken for new installs #3385

Discussion

• Is this the right place where this should be fixed?

Before

After

Future Work

• #775: Enable strictNullChecks in IDE #2791

[codecov-commenter]

Codecov Report

Merging #3386 (9c4bdca) into main (44225b6) will increase coverage by 0.00%.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##             main    #3386   +/-   ##
=======================================
  Coverage   37.65%   37.66%           
=======================================
  Files         755      755           
  Lines       21805    21801    -4     
  Branches     4651     4651           
=======================================
  Hits         8211     8211           
+ Misses      12669    12666    -3     
+ Partials      925      924    -1     

Impacted Files	Coverage Δ
src/hooks/useTheme.ts	0.00% <0.00%> (ø)

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[fregante]

Closing in favor of #3384