Werk #4067: Fixed broken inventory history view in current master

Component	HW/SW inventory
Title	Fixed broken inventory history view in current master
Date	Nov 14, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i3 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

An exception "TypeError: 'NoneType' object is not callable" could happend while rendering a inventory history page.

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