Werk #2823: Availability: Fixed division by zero error on rendering the availability table

Component	Reporting & availability
Title	Availability: Fixed division by zero error on rendering the availability table
Date	Jan 8, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i4 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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