Werk #12469: BI: fixed race condition leading to empty aggregation pages

Component	BI
Title	BI: fixed race condition leading to empty aggregation pages
Date	May 18, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0p6 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Due to a data write/read race condition, there was a small risk that the aggregation page would not display any aggregates at all.

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