Werk #6092: docker_node_images: Fixed crash in case of agent output from old docker versions

Component	Checks & agents
Title	docker_node_images: Fixed crash in case of agent output from old docker versions
Date	May 15, 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) 1.5.0b4 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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