Werk #3178: docsis_channels_upstream: Fixed crash in graphs

Component	Checks & agents
Title	docsis_channels_upstream: Fixed crash in graphs
Date	Feb 22, 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) 1.2.8b3 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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