Ignore 'The specified blob does not exist' error #402

Job	Run time
Go build with -tags=stringlabels	1m 32s
Check misspelled words	10s
Go build for different platforms	2m 46s
Thanos end-to-end tests (8, 0)	1m 52s
Thanos end-to-end tests (8, 1)	1m 52s
Linters (Static Analysis) for Go	20s
Thanos end-to-end tests (8, 2)	1m 50s
Thanos unit tests	7m 20s
Thanos end-to-end tests (8, 3)	1m 53s
Thanos end-to-end tests (8, 4)	1m 55s
Thanos end-to-end tests (8, 5)	1m 57s
Thanos end-to-end tests (8, 6)	1m 51s
Thanos end-to-end tests (8, 7)	1m 51s
	27m 9s

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