IBX-9297: Custom CSS can not be removed from link element #861

Job	Run time
Run code style check (8.0)	22s
Solr integration tests	1m 23s
Tests (7.4)	40s
Tests (8.0)	39s
Tests (8.1)	54s
MySQL integration tests (7.4)	1m 20s
PostgreSQL integration tests (7.4)	1m 16s
MySQL integration tests (8.0)	1m 26s
PostgreSQL integration tests (8.0)	1m 7s
MySQL integration tests (8.1)	1m 18s
PostgreSQL integration tests (8.1)	1m 3s
	11m 28s

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