disable bulk buttons if selection is empty #33873

Job	Run time
Smoke (latest, Phpunit)	32s
Behat (8.1, Chrome)	5m 27s
Smoke (latest, CodingStyle)	42s
Unit (7.4, Phpunit)	1m 47s
Behat (8.1, Chrome Lowest)	5m 52s
Smoke (latest, StaticAnalysis)	42s
Docs	27s
Unit (7.4, Phpunit Lowest)	1m 58s
Behat (8.2, Chrome)	5m 26s
Behat (8.2, Chrome Lowest)	5m 19s
Unit (8.0, Phpunit)	2m 3s
Unit (8.0, Phpunit Lowest)	2m 6s
Behat (8.3, Chrome)	5m 25s
Unit (8.1, Phpunit)	1m 56s
Behat (8.3, Chrome Lowest)	5m 48s
Unit (8.1, Phpunit Lowest)	1m 55s
Behat (latest, Firefox)	5m 39s
Unit (8.2, Phpunit)	1m 50s
Behat (latest, Chrome Slow)	3m 4s
Unit (8.2, Phpunit Lowest)	1m 54s
Behat (latest, Firefox Slow)	8m 5s
Unit (8.3, Phpunit)	1m 45s
Unit (8.3, Phpunit Lowest)	2m 0s
Unit (latest, Phpunit Burn)	4m 54s
	1h 16m 36s

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