Bugzilla: 41594 copy setnewproperty sanity protection to setproperty

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@506547 13f79535-47bb-0310-9956-ffa450edef68

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

@@ -327,7 +327,9 @@ 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);
+        }
         return true;
     }