Filter empty labels from sharding key #8206

Job	Run time
test	17m 56s
test	17m 56s
build	3m 57s
build	3m 57s
lint	16m 54s
lint	16m 54s
integration-configs-db	1m 51s
integration-configs-db	1m 51s
integration (requires_docker)	5m 7s
integration (requires_docker)	5m 7s
integration (integration_alertmanager)	3m 52s
integration (integration_alertmanager)	3m 52s
integration (integration_backward_compatibility)	7m 27s
integration (integration_backward_compatibility)	7m 27s
integration (integration_memberlist)	7m 18s
integration (integration_memberlist)	7m 18s
integration (integration_querier)	12m 39s
integration (integration_querier)	12m 39s
integration (integration_ruler)	3m 34s
integration (integration_ruler)	3m 34s
integration (integration_query_fuzz)	1m 46s
integration (integration_query_fuzz)	2m 1s
deploy	0s
deploy	0s
deploy_website	0s
deploy_website	0s
	2h 44m 57s

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