PVS-Studio warning V596 for OpenMS

inline UInt asUInt_(const String & in)
{
  UInt res = 0;
  try
  {
    Int tmp = in.toInt();
    if (tmp < 0)
    {
      Exception::ConversionError(__FILE__, __LINE__,
                                 __PRETTY_FUNCTION__, "");
    }
    res = UInt(tmp);
  }
  catch (Exception::ConversionError)
  {
    error(LOAD,
          String("UInt conversion error of \"") + in + "\"");
  }
  return res;
}

This suspicious code was found in OpenMS project by PVS-Studio static code analyzer.
Warning message is:
V596 The object was created but it is not being used. The 'throw' keyword could be missing: throw ConversionError(FOO); xmlhandler.h 247

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/