Handle null parent of CODEOWNER file

[fan-tom]

Closes #106

[github-actions[bot]]

Qodana Community for JVM

69 new problems were found

Inspection name	Severity	Problems
Unused symbol	🔶 Warning	18
Unused import directive	🔶 Warning	17
Unstable API Usage	🔶 Warning	8
Unresolved reference in KDoc	🔶 Warning	5
Constant conditions	🔶 Warning	2
Redundant nullable return type	🔶 Warning	2
Redundant SAM constructor	🔶 Warning	1
Class member can have 'private' visibility	◽️ Notice	8
Boolean literal argument without parameter name	◽️ Notice	4
Private property naming convention	◽️ Notice	2
Function or property has platform type	◽️ Notice	1
'when' that can be simplified by introducing an argument	◽️ Notice	1

💡 Qodana analysis was run in the pull request mode: only the changed files were checked

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