Werk #2774: Fix exception when deleting certain types of MIBs

Component Setup
Title Fix exception when deleting certain types of MIBs
Date Nov 6, 2015
Checkmk Edition Checkmk Raw (CRE)
Checkmk Version 1.2.8b1 1.2.7i4
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

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