You don't need to put any space in empty table cell, but if you want it to look the same as nonempty table cell, you'd have to define empty cell with CSS in your html head section or in an external css file. 
<style type="text/css">
table {empty-cells: show; }
</style>

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In reply to Re: lost wtih blank data by igoryonya
in thread lost wtih blank data by saffron

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