check for valid targets in resolve for The Abyss.

src/forge/GameActionUtil.java

@@ -3609,6 +3609,7 @@ public class GameActionUtil {
 				@Override
 				public void resolve() {
 					if(player.equals(AllZone.HumanPlayer)) {
+						if(abyss_getTargets(player, abyss).size() > 0) {
 							AllZone.InputControl.setInput( new Input() {
 								private static final long serialVersionUID = 4820011040853968644L;
 								public void showMessage() {
@@ -3625,6 +3626,7 @@ public class GameActionUtil {
 								}//selectCard()
 							});//Input
 						}
+					}
 					else { //computer
 						CardList targets = abyss_getTargets(player,abyss);
 						CardList indestruct = targets.getKeyword("Indestructible");