Fix saving preferences while AI API key is empty #18034

Job	Run time
Checkstyle	1m 58s
OpenRewrite	2m 29s
CHANGELOG.md	13s
Markdown	6s
CHANGELOG.md - only unreleased touched	14s
Modernizer	1m 5s
Unit tests	6m 5s
Code coverage	27s
Database tests	4m 24s
Validate Gradle Wrapper	7s
GUI tests	1m 25s
Find merge conflicts	8s
Source branch is other than "main"	1s
	18m 42s

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