Werk #4413: mem.linux: handle empty info

Component	Checks & agents
Title	mem.linux: handle empty info
Date	Feb 22, 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) 1.4.0b3 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.2.8p18 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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