Werk #8979: lnx_bonding: Fix key error if no aggregator ID is available

Component	Checks & agents
Title	lnx_bonding: Fix key error if no aggregator ID is available
Date	Aug 29, 2019
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0b8 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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