Werk #10310: Remove duplicated check-output in IF checks on average data

Component	Checks & agents
Title	Remove duplicated check-output in IF checks on average data
Date	Oct 22, 2019
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.6.0p6 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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