Werk #14549: mongodb_collections, mongodb_replica_set: Fix date parsing error

Component	Checks & agents
Title	mongodb_collections, mongodb_replica_set: Fix date parsing error
Date	Aug 3, 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 2.1.0p10 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 2.0.0p28 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

Depending on the pymongo version on the host system, the two check plugins mentioned above crashed with

TypeError: unsupported operand type(s) for /: 'str' and 'float'
TypeError: unsupported operand type(s) for -: 'str' and 'str'

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