fix(schema-compiler): Yaml - crash on fully commented file

[ovr]

Hello!

Thanks

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (6b1fadb) 46.98% compared to head (9ea45db) 46.99%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6413   +/-   ##
=======================================
  Coverage   46.98%   46.99%           
=======================================
  Files         152      152           
  Lines       20248    20250    +2     
  Branches     5187     5188    +1     
=======================================
+ Hits         9514     9516    +2     
  Misses       9896     9896           
  Partials      838      838           

Flag	Coverage Δ
cube-backend	46.99% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ubejs-schema-compiler/src/compiler/YamlCompiler.ts	71.25% <100.00%> (+0.36%)	⬆️

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