Actually permit validargs and defaultvalue together in the default handler.

Formerly, would just prompt you again if you just pressed Enter.


git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@426184 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/input/MultipleChoiceInputRequest.java

@@ -51,6 +51,6 @@ public class MultipleChoiceInputRequest extends InputRequest {
      * @return true if the input is one of the allowed values.
      */
     public boolean isInputValid() {
-        return choices.contains(getInput());
+        return choices.contains(getInput()) || ("".equals(getInput()) && getDefaultValue() != null);
     }
 }