Werk #7391: mk_mongodb: don't crash upon missing flushing info

Component Checks & agents
Title mk_mongodb: don't crash upon missing flushing info
Date Apr 3, 2019
Checkmk Edition Checkmk Raw (CRE)
Checkmk Version 1.6.0b1
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

The plugin no longer crashes the server does not report info on 'backgroundFlushing', as is the case for MongoDB 4.0 onwards.

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