QPieSlice border set to black removes the border

I have a derived class from QtCharts::QPieSlice doing this in the constructor:

BalanceSlice::BalanceSlice(code_t ac, double amount, code_t vc, double value, double total)
: BaseBalanceSlice(buildLabel(ac, vc, value, total), value, vc),
m_amount(amount),
m_ac(ac)

{ const currency_info_t *aInfo = getInfo(ac); QColor color(aInfo->rgb); setColor(color); setBorderColor(color); }

 

when aInfo->rgb value is 0x00, the border is missing around the slice and the legend marker.

Workaround:

aInfo->rgb = 0x000001 makes the border reappear.