BlockStructureBraces assertion failed

[kentr0w]

What's done:

Fixed bug with add children
closes #436

[codecov]

Codecov Report

Merging #461 into master will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #461      +/-   ##
============================================
+ Coverage     81.91%   81.97%   +0.05%     
- Complexity     1461     1464       +3     
============================================
  Files            71       71              
  Lines          3689     3689              
  Branches       1178     1178              
============================================
+ Hits           3022     3024       +2     
+ Misses          202      201       -1     
+ Partials        465      464       -1     

Flag	Coverage Δ	Complexity Δ
#unittests	81.97% <100.00%> (+0.05%)	1464.00 <0.00> (+3.00)

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

Impacted Files	Coverage Δ	Complexity Δ
.../cqfn/diktat/ruleset/rules/BlockStructureBraces.kt	83.80% <100.00%> (ø)	53.00 <0.00> (ø)
...n/org/cqfn/diktat/ruleset/utils/StringCaseUtils.kt	82.08% <0.00%> (ø)	0.00% <0.00%> (ø%)
...set/rules/calculations/AccurateCalculationsRule.kt	79.72% <0.00%> (+1.35%)	47.00% <0.00%> (+2.00%)
...fn/diktat/ruleset/rules/classes/DataClassesRule.kt	84.21% <0.00%> (+2.63%)	25.00% <0.00%> (+1.00%)

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[petertrr]

lgtm