PVS-Studio warning V530 for QuantLib

void EnergyCommodity::calculateSecondaryCostAmounts(
  const CommodityType& commodityType,
  Real totalQuantityValue,
  const Date& evaluationDate) const
{
  secondaryCostAmounts_.empty();
  ....
}

This suspicious code was found in QuantLib project by PVS-Studio static code analyzer.
Warning message is:
V530 The return value of function 'empty' is required to be utilized. energycommodity.cpp 152

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/