Rougier was booked for a foul on Adam Drury as the home side's frustrations grew and Emblen's right-foot shot was blocked by Murty as time began to run out.
The hosts made three changes to the side defeated by Wimbledon at the weekend with Tony Rougier, Upson and Graeme Murty coming in for Ricky Newman, Martin Butler and Nicky Shorey.
Hleb has played his last club game of the current campaign after being handed a three-match suspension by the Football Association for slapping Reading captain Graeme Murty during last week's Premier League encounter at the Emirates Stadium.