fix panic in ingester when not running with boltdb shipper while queriers does #2830
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What this PR does / why we need it:
When ingesters are not running
boltdb-shipper
,GetChunkIDs
proto call returns anil
response instead of empty response which causes ingesters to panic, trying to marshal a nil value. This would happen when ingesters are not runningboltdb-shipper
while queriers are.