coverity#1341875 Division or modulo by float zero

Change-Id: I3a07361bb66a62533475618c9b50f184d791a799

lotuswordpro/source/filter/lwptablelayout.cxx

@@ -611,7 +611,7 @@ void LwpTableLayout::RegisterColumns()
     }
 
     // justifiable columns will share the remain width averagely
-    dDefaultColumn = dTableWidth/nJustifiableColumn;
+    dDefaultColumn = nJustifiableColumn ? dTableWidth/nJustifiableColumn : 0;
 
     // register default column style
     XFColStyle *pColStyle = new XFColStyle();