Fabricate: if the only option is to create servo tokens, just do that. Avoids IndexOutOfBoundsException.

forge-ai/src/main/java/forge/ai/ability/ChooseGenericEffectAi.java

@@ -236,6 +236,12 @@ public class ChooseGenericEffectAi extends SpellAbilityAi {
             return Aggregates.random(spells);
         } else if (logic.startsWith("Fabricate")) {
             final int n = Integer.valueOf(logic.substring("Fabricate".length()));
+            if(spells.size() < 2) {
+				// If the creature is no longer on the battlefield, the option
+				// to add counters is already removed at this point. Return the
+				// only available option: create servo tokens.
+            	return spells.get(0);
+            }
             SpellAbility counterSA = spells.get(0), tokenSA = spells.get(1);
 
             // check for something which might prevent the counters to be placed on host