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Werk #3918: Inventory history: Fixed possible exception when renedering history tables

Component HW/SW inventory
Title Inventory history: Fixed possible exception when renedering history tables
Date Nov 14, 2016
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed
Checkmk versions & editions
1.4.0i3 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT
1.2.8p18 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

Different kind of exceptions could occur, all in the inv_*() functions. For example in inv_paint_timestamp_as_age() the error "TypeError: unsupported operand type(s) for -: 'float' and 'tuple'"

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