tweak

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@9191 d0543943-73ff-0310-b7d9-9358b9ac24b2

conf/dialplan/extensions/99999_enum.xml

 <include>
   <extension name="enum">
+    <condition field="${module_exists(mod_enum)}" expression="true"/>
     <condition field="destination_number" expression="^(.*)$">
       <action application="transfer" data="$1 enum"/>
     </condition>