It's normal to see small cracks around the edges of the dough as you roll it out. Be careful to evenly roll out the dough in different directions so that one side doesn't become more thin/delicate than another side and rip. If your dough is tearing or ripping across the center, try adding more ice water next time. But you can do a quick fix by transferring the dough to the pie dish and using a wet finger to push the edges of the dough together and "seal" it.