Werk #12302: Fix cache miss in SNMP discovery

Component	Checks & agents
Title	Fix cache miss in SNMP discovery
Date	Jun 10, 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)

Here we fix cache misses for SNMP data where discovery would miss entries.

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