disable bulk buttons if selection is empty #33871

Job	Run time
Docs	33s
Smoke (latest, Phpunit)	29s
Unit (7.4, Phpunit)	1m 45s
Smoke (latest, CodingStyle)	44s
Behat (8.1, Chrome)	5m 32s
Unit (7.4, Phpunit Lowest)	1m 59s
Smoke (latest, StaticAnalysis)	47s
Behat (8.1, Chrome Lowest)	5m 33s
Unit (8.0, Phpunit)	1m 48s
Behat (8.2, Chrome)	5m 13s
Unit (8.0, Phpunit Lowest)	1m 53s
Behat (8.2, Chrome Lowest)	5m 18s
Unit (8.1, Phpunit)	1m 51s
Behat (8.3, Chrome)	5m 22s
Unit (8.1, Phpunit Lowest)	1m 51s
Behat (8.3, Chrome Lowest)	5m 22s
Behat (latest, Firefox)	5m 37s
Unit (8.2, Phpunit)	1m 50s
Behat (latest, Chrome Slow)	2m 54s
Unit (8.2, Phpunit Lowest)	1m 49s
Behat (latest, Firefox Slow)	7m 57s
Unit (8.3, Phpunit)	1m 59s
Unit (8.3, Phpunit Lowest)	1m 52s
Unit (latest, Phpunit Burn)	5m 1s
	1h 14m 59s

Provide feedback