CachedRowSetImpl.populate does not handle map properly

CachedRowSetImpl.populate does not correctly validate whether a map object is specified

The check

                if (map == null ) {
                    obj = data.getObject(i);
                } else {
                    obj = data.getObject(i, map);
                }

Should be

                if (map == null || map.size() == 0) {
                    obj = data.getObject(i);
                } else {
                    obj = data.getObject(i, map);
                }

if a webrowset is read in and has an empty map tag, you would have a non-null value for map and then try to execute

obj = data.getObject(i, map);

Which is not supported on all databases such as derby