Deal with assets that do not exist in the output

[agubler]

Type: bug

The following has been addressed in the PR:

• There is a related issue
• All code has been formatted with prettier
• Unit or Functional tests are included in the PR

Description:

Skip assets that do not exist the when logging the command output. This stops the build crashing when using --watch with BTR and Blocks.

Resolves #256

[codecov]

Codecov Report

Merging #258 into master will increase coverage by 0.15%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #258      +/-   ##
==========================================
+ Coverage   52.17%   52.32%   +0.15%     
==========================================
  Files          10       10              
  Lines         621      623       +2     
  Branches      156      157       +1     
==========================================
+ Hits          324      326       +2     
  Misses        297      297

Impacted Files	Coverage Δ
src/logger.ts	100% <100%> (ø)	⬆️

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