title: Remove template row in JXLS when input list is empty
body: <p>I'm using JXLS to populate a template excel spreadsheet.  Sometimes, one input - a list - is empty.  When this happens, the template fields which use this list are shown in the populated spreadsheet in full JXLS regalia - eg, "<code>${someList.someValue}</code>".</p>
  
  <p>The fields in question are all in a single row (expanded to <code>list.size()</code> rows by JXLS).  I want to clear the whole row when there are no records in the list.</p>
  
  <p>Is there a way to do so in JXLS?  Alternatively, can anyone suggest a complementary way to use JExcel or POI to do so?</p>