Werk #4178: apt: Fixed crash on unexpected output

Component	Checks & agents
Title	apt: Fixed crash on unexpected output
Date	Dec 12, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i3 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Fixed crash if line does not start with "Inst".

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