Default attribute value overwritten by target type

If target_type default attribute was blank, it was overwriting
attribute_type default value.   this fix checks for a non-empty 
default value before assigning to children.

Author: nkskjames

src/com/ibm/ServerWizard2/model/AttributeValueNative.java

@@ -26,7 +26,10 @@ public void readXML(Element e) {
 	}
 
 	public void readInstanceXML(Element e) {
-		field.value = SystemModel.getElement(e, "default");
+		String v = SystemModel.getElement(e, "default");
+		if (!v.isEmpty() || field.value.isEmpty()) {
+			field.value = v;
+		}
 	}
 
 	@Override

src/com/ibm/ServerWizard2/model/AttributeValueSimple.java

@@ -62,7 +62,10 @@ public void readXML(Element e) {
 	}
 
 	public void readInstanceXML(Element e) {
-		field.value = SystemModel.getElement(e, "default");
+		String v = SystemModel.getElement(e, "default");
+		if (!v.isEmpty() || field.value.isEmpty()) {
+			field.value = v;
+		}
 	}
 
 	@Override