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

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