Werk #10257: Do not make whole discovery page fail on single discovery function issue

Component	Setup
Title	Do not make whole discovery page fail on single discovery function issue
Date	Oct 15, 2019
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.6.0p5 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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