IBX-6467: Richtext field validation is not styled properly #557

Job	Run time
Run code style check (8.0)	41s
Tests (7.4)	50s
Tests (8.0)	37s
Solr integration tests	1m 9s
Tests (8.1)	58s
MySQL integration tests (7.4)	1m 20s
PostgreSQL integration tests (7.4)	1m 21s
MySQL integration tests (8.0)	1m 21s
PostgreSQL integration tests (8.0)	1m 10s
MySQL integration tests (8.1)	1m 52s
PostgreSQL integration tests (8.1)	1m 34s
	12m 53s

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