Werk #3186: fortigate_node: fixed empty item

Component	Checks & agents
Title	fortigate_node: fixed empty item
Date	Feb 16, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Incompatible - Manual interaction might be required
Checkmk versions & editions	1.4.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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