Disable bulk action buttons if selection is empty #33887

Job	Run time
Docs	39s
Behat (8.1, Chrome)	5m 24s
Smoke (latest, Phpunit)	23s
Behat (8.1, Chrome Lowest)	5m 37s
Smoke (latest, CodingStyle)	43s
Behat (8.2, Chrome)	5m 28s
Smoke (latest, StaticAnalysis)	45s
Behat (8.2, Chrome Lowest)	5m 37s
Behat (8.3, Chrome)	14m 12s
Behat (8.3, Chrome Lowest)	5m 27s
Behat (latest, Firefox)	5m 37s
Behat (latest, Chrome Slow)	10m 5s
Behat (latest, Firefox Slow)	8m 18s
Unit (7.4, Phpunit)	1m 47s
Unit (7.4, Phpunit Lowest)	2m 3s
Unit (8.0, Phpunit)	1m 50s
Unit (8.0, Phpunit Lowest)	1m 59s
Unit (8.1, Phpunit)	1m 57s
Unit (8.1, Phpunit Lowest)	2m 2s
Unit (8.2, Phpunit)	1m 52s
Unit (8.2, Phpunit Lowest)	2m 2s
Unit (8.3, Phpunit)	3m 41s
Unit (8.3, Phpunit Lowest)	1m 50s
Unit (latest, Phpunit Burn)	4m 44s
	1h 34m 2s

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