Title: Inventory history: Fixed possible exception when renedering history tables
Level: 1
Component: inv
Class: fix
Compatible: compat
State: unknown
Version: 1.2.8p18
Date: 1479152226

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'"
