[BUG] It Will Skip The First Cell[Axx] When Read Last Empty & Merged Line.

[SeeMeJuiner]

🐛 Bug Report

Lib version: 4.4.0

Steps To Reproduce

sheet.eachRow(function (row, rowNumber) {
        if(rowNumber == 60) {
          debugger
        }
        records += '{';
        row.eachCell(function (cell, cellNumber) {
          if((cell.isMerged && cell._mergeCount > 0) || ( cell.master.address && cell.master._mergeCount > 0 )) {
            let mergeCell = {
              start: {col: undefined, row: undefined},
              end: {col: undefined, row: undefined},
            };

            // 
            if (cell.master.address && cell.master.address != cell.address) {
              // 
              mergeCell.start.col = mergeCells[cell.master.col + '-' + cell.master.row].start.col;    **<---It will occurs a error "Cannot read properties of undefined (reading 'start')"**  like image 3 as below
              mergeCell.start.row = mergeCells[cell.master.col + '-' + cell.master.row].start.row;
              mergeCell.end.col = mergeCells[cell.master.col + '-' + cell.master.row].end.col;
              mergeCell.end.row = mergeCells[cell.master.col + '-' + cell.master.row].end.row;
            } else {
              mergeCell.start.col = sheet._merges[cell.address].model.left - 1;
              mergeCell.start.row = sheet._merges[cell.address].model.top;
              mergeCell.end.col = sheet._merges[cell.address].model.right - 1;
              mergeCell.end.row = sheet._merges[cell.address].model.bottom;
            }
            mergeCells[cell.col + '-'+ cell.row] = mergeCell;
          }
          records += cell.col + ': ' + '"' + cell.value + '"';
          if(cell.col != row.cellCount) {
            records += ','
          }
        })
        records += '}';
        if(row.number != sheet.rowCount) {
          records += ',\n';
        }
      })

image 1

image2

image 3

The expected behaviour:

can read every cells when last row is emptly and merged.

Possible solution (optional, but very helpful):