PVS-Studio warning V530 for amtsdk

bool MCSOL::_createHTLink()
{
  ...
  string HTcmd = TERM_CMD;
  ...
  HTcmd.empty();
  ...
}

This is what should have been written here: HTcmd.clear();

This suspicious code was found in amtsdk project by PVS-Studio static code analyzer.
Warning message is:
V530 The return value of function 'empty' is required to be utilized. AMTredirection mcsol.cpp 443

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/