minor fix; allow raw json serializers to serialize optional (null) values properly

Author: arthurblake

src/org/jabsorb/serializer/impl/RawJSONArraySerializer.java

@@ -78,7 +78,7 @@ public Object marshall(SerializerState state, Object p, Object o)
 
       for (i=0; i<j; i++)
       {
-        Object json = ser.marshall(state, o, jsonIn.get(i), new Integer(i));
+        Object json = ser.marshall(state, o, jsonIn.opt(i), new Integer(i));
         jsonOut.put(i, json);
       }
     }

src/org/jabsorb/serializer/impl/RawJSONObjectSerializer.java

@@ -80,7 +80,7 @@ public Object marshall(SerializerState state, Object p, Object o)
       {
         key = i.next();
 
-        Object j = ser.marshall(state, o, jsonIn.get(key), key);
+        Object j = ser.marshall(state, o, jsonIn.opt(key), key);
         jsonOut.put(key, j);
       }
     }