Werk #5098: Fix sporadic exception during activation

Component	Setup
Title	Fix sporadic exception during activation
Date	Aug 7, 2017
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.4.0p10 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

In some case a race condition could lead to an OSError exception during activation due to vanished files. This has been fixed.

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