Werk #3746: tinkerforge: Keep check from crashing in case of unconfigured params

Component	Checks & agents
Title	tinkerforge: Keep check from crashing in case of unconfigured params
Date	Sep 16, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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