Werk #2577: printer_input, printer_output: Fix exception on Brother NC-340h

Component	Checks & agents
Title	printer_input, printer_output: Fix exception on Brother NC-340h
Date	Sep 3, 2015
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i3 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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