It is a fact that Real Madrid couldn't score more than one goal in their last two La Liga games. But they were able to score more before these ones in the absence of Benzema as well (e.g. 4 goals vs Mallorca, 2 goals vs Betis).

Considering that I think the reason of this might be related to their thinking of the Champions League games as well. They need to keep things balanced in the end and maybe they don't want to push hard in the La Liga as long as they are able to win a game one way or another. But it is the truth that Benzema is a big factor that helps the number of goals the team score increase more in most of the games.