py3: threshold_get_color to set color=None on exception (#1634)
py3: threshold_get_color to set color=None on exception (#1634)


ultrabug/py3status,ultrabug/py3status,valdur55/py3status,Andrwe/py3status,ultrabug/py3status,Andrwe/py3status,valdur55/py3status,valdur55/py3status