"Walikuambia habari njema" should also be accepted. -zuri and -ema are the same in most contexts, certainly here where the noun being modified is habari.
the tense would be wrong, but yes, -zuri and -ema can be used
Thanks. Right about the tense -- kidole changu kilinikosesha :)
Wamewaambieni habari nzuri? Reported...