Werk #7501: Handling invalid core config problems during updates more friendly

Component	Site management
Title	Handling invalid core config problems during updates more friendly
Date	Jun 25, 2015
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i3 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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