Werk #3540: Fixed exception on reading cachefiles

Component	Checks & agents
Title	Fixed exception on reading cachefiles
Date	Jun 6, 2016
Level	Prominent 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) 1.2.8p4 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

This fixes the Check_MK agent error %d format: a number is required, not NoneType which was introduced in the last version.

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