Werk #7432: postgres_instances: fix crash of the parse function

Component Checks & agents
Title postgres_instances: fix crash of the parse function
Date Jul 1, 2019
Checkmk Edition Checkmk Raw (CRE)
Checkmk Version 1.6.0b3 2.0.0i1
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

The check crashed with the error:

TypeError (update expected at most 1 arguments, got 2)

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