Werk #7723: printer_input: Crash upon missing data

Component	Checks & agents
Title	printer_input: Crash upon missing data
Date	May 22, 2019
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.6.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Missing snmp data lead to a crash of the generic check function check_printer_io() which affected several checks like e.g. check printer_input.

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