Werk #1549: bluecat_threads: do not inventorize this check where information is missing

Component	Checks & agents
Title	bluecat_threads: do not inventorize this check where information is missing
Date	Nov 25, 2014
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.6b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

This avoid UNKNOWN check results on devices where no thread information is available.

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