Fixes empty lines in yaml maps

[soywiz]

Fix from @jobe-m backported from korlibs/kproject#12

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.02 ⚠️

Comparison is base (5b97cea) 51.22% compared to head (5aba0d1) 51.21%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1570      +/-   ##
==========================================
- Coverage   51.22%   51.21%   -0.02%     
==========================================
  Files        1672     1672              
  Lines       98738    98744       +6     
  Branches    14117    14119       +2     
==========================================
- Hits        50579    50572       -7     
+ Misses      44300    44295       -5     
- Partials     3859     3877      +18     

Flag	Coverage Δ
unittests	51.21% <100.00%> (-0.02%)	⬇️

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Impacted Files	Coverage Δ
...nMain/kotlin/korlibs/io/serialization/yaml/Yaml.kt	81.81% <100.00%> (+0.12%)	⬆️
...t/kotlin/korlibs/io/serialization/yaml/YamlTest.kt	98.30% <100.00%> (+0.02%)	⬆️
...ommonMain/kotlin/korlibs/template/internal/Yaml.kt	81.81% <100.00%> (+0.12%)	⬆️
...src/commonTest/kotlin/korlibs/template/YamlTest.kt	98.30% <100.00%> (+0.02%)	⬆️

... and 21 files with indirect coverage changes

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[jobe-m]

LGTM!