PHPUnit 10 marks empty data provider as invalid with the text "Empty data set provided by data provider" and count this as errors.
Some implementation of `EntityHandlerTestCase` seems to provide empty data provider or calling `markTestSkipped`
```
There was 3 PHPUnit error:
1) Wikibase\Lexeme\Tests\MediaWiki\Content\LexemeHandlerTest::testGetUndoContent
The data provider specified for Wikibase\Lexeme\Tests\MediaWiki\Content\LexemeHandlerTest::testGetUndoContent is invalid
provideGetUndoContent only works for entities that have labels field
WikibaseLexeme\tests\phpunit\mediawiki\Content\LexemeHandlerTest.php:343
2) Wikibase\Search\Elastic\Tests\ItemHandlerTest::testSerialization
The data provider specified for Wikibase\Search\Elastic\Tests\ItemHandlerTest::testSerialization is invalid
Empty data set provided by data provider
WikibaseCirrusSearch\tests\phpunit\ItemHandlerTest.php:189
3) Wikibase\Search\Elastic\Tests\PropertyHandlerTest::testSerialization
The data provider specified for Wikibase\Search\Elastic\Tests\PropertyHandlerTest::testSerialization is invalid
Empty data set provided by data provider
WikibaseCirrusSearch\tests\phpunit\PropertyHandlerTest.php:189
```