The only thing that stops Israel from going to Hague against palestinians is a fact that palestinians are not members in Hague court institute. In order to sue Israel they should become members first and from this moment they will be exposed to Israeli suits. And I'm not sure how bad they want it - it looks like Israel has much better case.
Libya rival government calls for regional conference to tackle migrant influx (Reuters)
from the article: Palestinians to Israel: Stop E-1 plan or we'll go to The Hague