what is the best approach to default the value for a drop-down in JSF/Seam?  I am using the <s:convertEntity/> tag like so:

<h:selectOneMenu value="#{manageSiteId.selectedListValueForSiteId}">
     <s:selectItems var="lv"
               value="#{populateDropDown.getListValueList('SITES')}"
               label="#{lv.description}"
               noSelectionLabel="Please select..."/>                                                                                
               <s:convertEntity />
               <a4j:support event="onchange" action="#{manageSiteId.changeSiteId()}"/>
</h:selectOneMenu>

Is it ok to just check for null in the getter and return the proper value, otherwise return what was saved/selected?