Disable bulk action buttons if selection is empty #33879

Job	Run time
Docs	1m 2s
Behat (8.1, Chrome)	5m 21s
Smoke (latest, Phpunit)	34s
Behat (8.1, Chrome Lowest)	5m 46s
Smoke (latest, CodingStyle)	46s
Behat (8.2, Chrome)	5m 23s
Smoke (latest, StaticAnalysis)	41s
Unit (7.4, Phpunit)	2m 5s
Behat (8.2, Chrome Lowest)	5m 35s
Unit (7.4, Phpunit Lowest)	1m 57s
Behat (8.3, Chrome)	14m 42s
Unit (8.0, Phpunit)	2m 4s
Behat (8.3, Chrome Lowest)	5m 25s
Unit (8.0, Phpunit Lowest)	1m 59s
Behat (latest, Firefox)	5m 48s
Unit (8.1, Phpunit)	1m 54s
Behat (latest, Chrome Slow)	10m 17s
Unit (8.1, Phpunit Lowest)	2m 1s
Behat (latest, Firefox Slow)	8m 19s
Unit (8.2, Phpunit)	1m 58s
Unit (8.2, Phpunit Lowest)	1m 50s
Unit (8.3, Phpunit)	3m 28s
Unit (8.3, Phpunit Lowest)	1m 59s
Unit (latest, Phpunit Burn)	4m 54s
	1h 35m 48s

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