Werk #11397: Fix Service discovery when service checkoutput has values of -inf

Component	Setup
Title	Fix Service discovery when service checkoutput has values of -inf
Date	Jan 11, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0b4 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0p21 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

This extends werk 7469, by making sure checkoutputs with values of -inf don't crash the service discovery page.

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