Werk #13041: mtr agent plugin: fix multiple issues

Component Checks & Agents
Title mtr agent plugin: fix multiple issues
Date Sep 21, 2021
Checkmk Editon Checkmk Raw (CRE)
Checkmk Version 2.0.0p12 2.1.0i1
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

Multiple issues prohibited running mtr agent plugin with a minimal config:

A already running mtr process was not detected correctly.

Default Values where not applied correlty, instead a empty string was used for multiple missing values.

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