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 Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0b2 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.4.0p31 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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