Werk #3979: vbox_guest: Only try to fetch VBox state in case the vboxguest module is loaded

Component	Checks & agents
Title	vbox_guest: Only try to fetch VBox state in case the vboxguest module is loaded
Date	Nov 7, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i3 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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