Werk #1516: win_disks: fix exception in case of empty signature

Component	HW/SW inventory
Title	win_disks: fix exception in case of empty signature
Date	Nov 21, 2014
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.6b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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