Werk #14832: docker_node_info: Fix inventorizing labels (which might be empty)

Component HW/SW inventory
Title docker_node_info: Fix inventorizing labels (which might be empty)
Date Sep 9, 2022
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed
Checkmk versions & editions
2.2.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)
2.1.0p12 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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