code: function emptyEdaFieldsModel(){
        const emptyModel = [
          {
            line: 1,
            activeColumn: 1,
            columns: [
              {
                numColumn: 1,
                exist: true,
                control: {
                  type: 'none',
                  key: 'none'
                }
              }
            ]
          }
        ];
        return emptyModel;
      }
docs: empty fields model : to display at least an empty line
  otherwise would look like ugly empty line like it were a bug