Werk #2004: windows_updates: fix exception in WATO when displaying default levels

Component	Checks & agents
Title	windows_updates: fix exception in WATO when displaying default levels
Date	Feb 20, 2015
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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