PVS-Studio warning V705 for KDE4

void EntryDetails::entryChanged(const KNS3::EntryInternal& entry)
{
  ....
  if(m_entry.previewUrl(EntryInternal::PreviewSmall1).isEmpty()){
    ui->previewBig->setVisible(false);
  } else                                //<==

  if (!m_entry.previewUrl((....)type).isEmpty()) {
    ....
  }
  ....
}

This suspicious code was found in KDE4 project by PVS-Studio static code analyzer.
Warning message is:
V705 It is possible that 'else' block was forgotten or commented out, thus altering the program's operation logics. entrydetailsdialog.cpp 149

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/