Werk #6481: fileinfo: Abort calculating the size and age of a file if it's not readable

Component	Checks & agents
Title	fileinfo: Abort calculating the size and age of a file if it's not readable
Date	Aug 24, 2018
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.6.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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