fix: unhandled exception while parsing analysis_options.yaml

[dkrutskikh]

What is the purpose of this pull request? (put an "X" next to an item)

[ ] Documentation update
[X] Bug fix
[ ] New rule
[ ] Changes an existing rule
[ ] Add autofixing to a rule
[ ] Add a CLI option
[ ] Add something to the core
[ ] Other, please explain:

What changes did you make? (Give an overview)

Is there anything you'd like reviewers to focus on?

[codecov]

Codecov Report

Merging #473 (2279414) into master (473a956) will increase coverage by 0.01%.
The diff coverage is 100.00%.

❗ Current head 2279414 differs from pull request most recent head 2f4f0ba. Consider uploading reports for the commit 2f4f0ba to get more accurate results

@@            Coverage Diff             @@
##           master     #473      +/-   ##
==========================================
+ Coverage   83.53%   83.54%   +0.01%     
==========================================
  Files         187      187              
  Lines        3869     3872       +3     
==========================================
+ Hits         3232     3235       +3     
  Misses        637      637              

Impacted Files	Coverage Δ
.../anti_patterns/anti_patterns_list/long_method.dart	96.36% <100.00%> (+0.06%)	⬆️
...tterns/anti_patterns_list/long_parameter_list.dart	95.65% <100.00%> (+0.19%)	⬆️
lib/src/utils/yaml_utils.dart	100.00% <100.00%> (ø)

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