Extra check for null.

Input is calling setNewProperty - but if defaultValue and value are null
we'll get NPE

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git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@273732 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/PropertyHelper.java

@@ -369,7 +369,9 @@ public class PropertyHelper {
 
         project.log("Setting project property: " + name + " -> " +
                 value, Project.MSG_DEBUG);
-        properties.put(name, value);
+        if( name!= null && value!=null ) {
+            properties.put(name, value);
+        }
     }
 
     /**