Fixed migration of attack data

rpg-docs/server/migrations/migrations.js

@@ -65,6 +65,7 @@ Migrations.add({
 	up: function() {
 		//update attacks
 		Attacks.find({}).forEach(function(attack) {
+			if (!attack.damage && attack.damageDice && attack.damageBonus){
 				var newDamage = attack.damageDice +
 					" + {" + attack.damageBonus + "}";
 				Attacks.update(
@@ -79,6 +80,7 @@ Migrations.add({
 						},
 					},
 					{validate: false});
+			}
 		});
 		//update Items
 		Items.update(