Barbarian bar error

[joseasoler]

Happens after winning:

Traceback (most recent call last):

File "CvScreensInterface", line 787, in forceScreenRedraw

File "CvMainInterface", line 1393, in redraw

File "CvMainInterface", line 1576, in updateMiscButtons

File "CvMainInterface", line 3554, in updateCustomizableBars

ZeroDivisionError: float division ERR: Python function forceScreenRedraw failed, module CvScreensInterface