message: Always ensure time entry has GUID (lib), closes
diff: @@ -29,6 +29,7 @@ bool TimeEntry::operator == (const TimeEntry& a) const {
  }
  void TimeEntry::Fill(toggl::TimeEntry * const model) {
  + model->EnsureGUID();
  DurationInSeconds = model->DurationInSeconds();
  Description = model->Description();
  GUID = model->GUID();
  