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
Checkmk Editon Checkmk Raw (CRE)
Checkmk Version 2.2.0i1 2.1.0p12
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

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