Werk #6852: Fixed broken validation of host diagnose user input

Component	Setup
Title	Fixed broken validation of host diagnose user input
Date	Nov 8, 2018
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.6.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.5.0p8 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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