There have been quite a few 0-0 results down the years including the 1968 Cup semi-final between Wakefield and Huddersfield at Odsal and the 1988 Cup semi-final between Halifax and Hull at Headingley.
Lowest scores in the Super League era would be the 4-0 results involving Salford v Cas (1997) and Celtic-Saints (2009) but the only try-less SL game was Salford v Quins (5-2) in 2007.