Empty cell with data-cell-type="number" causes workbook corruption

[olivierr91]

<td data-cell-type="number"></td>

Generates a corrupted Excel workbook:

And cell has value 'NaN'.

Expected behavior:

The workbook should be generated correctly, cell should be blank and with the correct number format set.

jsreport.Binary (dotnet) v2.4.0

[bjrmatos]

good catch. we have this PR waiting for merge, which should resolve this problem, however i'm not sure that passing an empty value will make the empty cell be formatted as number, anyway i will resolve that PR later and verify if we can do something to preserve the cell as number but with empty value