Werk #8639: Fixed broken agent update status view

Component	Agent bakery
Title	Fixed broken agent update status view
Date	Nov 11, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i3 Checkmk Pro, Checkmk Ultimate MT

The agent update status view was unusable (Failed with the error "TypeError (%d format: a number is required, not NoneType)").

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