Fix for WW-1711:

current option is not selected if actual value to check is no String (aka: nameValue resolves to type other than String)

git-svn-id: https://svn.apache.org/repos/asf/struts/struts2/trunk@504142 13f79535-47bb-0310-9956-ffa450edef68

core/src/main/resources/template/simple/select.ftl

@@ -57,7 +57,7 @@
             <#assign itemValue = stack.findString('top')/>
         </#if>
     <option value="${itemKey?html}"<#rt/>
-        <#if tag.contains(parameters.nameValue, itemKey) == true>
+        <#if parameters.nameValue?exists && tag.contains(parameters.nameValue.toString(), itemKey) == true>
  selected="selected"<#rt/>
         </#if>
     >${itemValue?html}</option><#lt/>