Werk #3245: Fix interpretation of check levels 0.0 as "no levels"

Component	Checks & agents
Title	Fix interpretation of check levels 0.0 as "no levels"
Date	Feb 26, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.2.8b3 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

E.g. if you have set 0/0 as warn/crit levels for CPU load then the service would always be OK. This has now been fixed.

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