Werk #15266: Check plugin logwatch_ec: Improve detection of missing log files

Previously the Logwatch Event Console Forwarding service would not report log files as missing that are marked as such in the agent output:

<<<logwatch>>>
[[[logfile:missing]]]

This affected logfiles that were explicitly configured to be monitored, as opposed to configurations that capture multiple logfiles at once. With this werk this has been fixed.

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