Werk #2850: juniper_cpu: Better error handling of empty data reported by device

Component	Checks & agents
Title	juniper_cpu: Better error handling of empty data reported by device
Date	Dec 2, 2015
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i4 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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