Werk #4258: snmp_extended_info: fixed undefined variable

Component	HW/SW inventory
Title	snmp_extended_info: fixed undefined variable
Date	Jan 9, 2017
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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