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Werk #13677: mk_apt: Check crashes on single-line agent sections

Component Checks & agents
Title mk_apt: Check crashes on single-line agent sections
Date Mar 31, 2022
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed
Checkmk versions & editions
2.2.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT
2.1.0b5 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT
2.0.0p23 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

This fixes a regression that got introduced with Werk #13578.

While the above mentioned Werk fixed an issue with ignored security updates for the "APT normal and security updates" plugin, it made a wrong assumption to the output of the underlying apt-get command, that lead to a crash for outputs that exactly consist of one security update item.

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