Werk #6403: memory.include: return UNKNOWN if the total memory is not present

Component	Checks & agents
Title	memory.include: return UNKNOWN if the total memory is not present
Date	Aug 22, 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 1.5.0p3 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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