Werk #8128: Fix filedescriptor leak in CMC due to new error handling of check helpers

Component	The Checkmk Micro Core
Title	Fix filedescriptor leak in CMC due to new error handling of check helpers
Date	Dec 17, 2014
Level	Prominent Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i1 Checkmk Pro, Checkmk Ultimate MT

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