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This behavior can generally be attributed to the fact that the table cell contains the "  " HTML tag, which generates a non-breaking space. As SilkTest examines webpages at the DOM level it finds that the cell is not empty and therefore prints out a blank space when the GetRowText() function is used.
This is the expected behavior from SilkTest and you must remove the " " tag from your source code if you want those table cells to be excluded from the results GetRowText() function when the BrowserPage option "RowTextIncludesEmptyCells" is set to FALSE.