Get empty cells when row values are zeroes, expect number zero cells

[Deathsteps]

Fix the following issue:

The hotLevel column of the data is a column of number type, and many records will contains a zero value. The origin code will treat number zero as undefined and return the empty string.

         <ExcelFile>
            <ExcelSheet data={this.props.data} name="list">
              <ExcelColumn label="ID" value="id" />
              <ExcelColumn label="hotelName" value="name" />
              <ExcelColumn label="hotLevel" value="hotLevel" />
            </ExcelSheet>
          </ExcelFile>

[securedeveloper]

💯

[securedeveloper]

@Deathsteps Thank you for your code, I'm changing library to use Typescript and webpack, we will have better code and performance in coming weeks.