Merge pull request #1926 from rsandell/rsandell-enum-default

Added default attribute to enum.jelly

core/src/main/resources/lib/form/enum.jelly

@@ -32,10 +32,13 @@ THE SOFTWARE.
     <st:attribute name="field">
       Used for databinding. TBD.
     </st:attribute>
+    <st:attribute name="default">
+      The name of the enum to set as default value for the first configuration.
+    </st:attribute>
   </st:documentation>
   <select class="setting-input" name="${field}">
     <j:forEach var="it" items="${descriptor.getPropertyType(instance,field).enumConstants}">
-      <f:option value="${it.name()}" selected="${it==instance[field]}">
+      <f:option value="${it.name()}" selected="${instance != null ? it==instance[field] : it.name()==default}">
         <d:invokeBody />
       </f:option>
     </j:forEach>