Werk #6468: docker_node_network: Fix crashing HW/SW inventory when labels are not set

Component	HW/SW inventory
Title	docker_node_network: Fix crashing HW/SW inventory when labels are not set
Date	Sep 24, 2018
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.6.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0p5 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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