Werk #3217: fortigate_sessions: Fixed exception in case of empty data provided by the device

Component	Checks & agents
Title	fortigate_sessions: Fixed exception in case of empty data provided by the device
Date	Feb 16, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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