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If the sheet is empty, then Aspose.Cells will not print anything when you export a worksheet to an image. You can change this behavior by using ImageOrPrintOptions.OutputBlankPageWhenNothingToPrint property. When you set it to true, it will output a blank page.
The following sample code creates an empty workbook that contains an empty worksheet and renders the empty worksheet to an image after setting the ImageOrPrintOptions.OutputBlankPageWhenNothingToPrint property to true. Consequently, it generates a blank page because there is nothing to print, which you can see in the image below.

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