Werk #5972: docker_node_info: Fixed crash when a node with older version reports null labels

Component	Checks & agents
Title	docker_node_info: Fixed crash when a node with older version reports null labels
Date	Apr 11, 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) 1.5.0b2 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The inventory plugin made the Check_MK and Check_MK Inventory services crash when working with an older docker version.

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