PVS-Studio warning V530 for wxWidgets

bool wxMsgCatalogFile::LoadData(....)
{
  ...
  wxString m_charset;
  ...
  if ( m_charset == wxS("CHARSET") )
  {
    m_charset.empty();
  }
  ...
}

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

This suspicious code was found in wxWidgets project by PVS-Studio static code analyzer.
Warning message is:
V530 The return value of function 'empty' is required to be utilized. base translation.cpp 989

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/