Werk #5989: fireeye_content: Fixed exception, in case content update has never been performed

Component	Checks & agents
Title	fireeye_content: Fixed exception, in case content update has never been performed
Date	Apr 13, 2018
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.6.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.5.0b2 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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