Werk #1793: fritz: avoid Exception in inventory function of fritz checks if agent output is empty

Component	Checks & agents
Title	fritz: avoid Exception in inventory function of fritz checks if agent output is empty
Date	Dec 19, 2014
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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