Ignore cell for row insertion
<p>When creating a row to insert into Smartsheet, how does one ignore a cell?  The following example illustrates my point:</p>

<pre><code>new Cell.AddCellBuilder(sheet.Columns[2].Id, Convert.ToDateTime(StartDate)).Build() 
</code></pre>

<p>If the data I'm fetching doesn't return a valid date, I want to let this cell default to its empty value, i.e., ignore the building of the cell.  Is this possible, and if so, what would be the syntax for that?</p>

<p>Thank you.</p>