Werk #340: blade_health: fix check, it was totally broken

Component	Checks & agents
Title	blade_health: fix check, it was totally broken
Date	Dec 16, 2013
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.5i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

Thanks to a patch from Christof Musik.

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