Improve Querier's error message #379

Job	Run time
Go build with -tags=stringlabels	2m 4s
Go build with -tags=stringlabels	2m 4s
Check misspelled words	12s
Check misspelled words	12s
Go build for different platforms	8m 40s
Go build for different platforms	8m 40s
Linters (Static Analysis) for Go	3m 36s
Linters (Static Analysis) for Go	3m 36s
Thanos unit tests	18m 12s
Thanos unit tests	19m 16s
Thanos end-to-end tests (8, 0)	5m 43s
Thanos end-to-end tests (8, 0)	5m 43s
Thanos end-to-end tests (8, 1)	4m 18s
Thanos end-to-end tests (8, 1)	4m 18s
Thanos end-to-end tests (8, 2)	4m 18s
Thanos end-to-end tests (8, 2)	4m 18s
Thanos end-to-end tests (8, 3)	5m 27s
Thanos end-to-end tests (8, 3)	5m 27s
Thanos end-to-end tests (8, 4)	7m 50s
Thanos end-to-end tests (8, 4)	7m 50s
Thanos end-to-end tests (8, 5)	5m 4s
Thanos end-to-end tests (8, 5)	5m 4s
Thanos end-to-end tests (8, 6)	5m 9s
Thanos end-to-end tests (8, 6)	5m 9s
Thanos end-to-end tests (8, 7)	4m 45s
Thanos end-to-end tests (8, 7)	4m 45s
	2h 31m 40s

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