Werk #2736: fortigate_cpu: fix crash if levels are disabled

Component	Checks & agents
Title	fortigate_cpu: fix crash if levels are disabled
Date	Nov 6, 2015
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.6p13 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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