Don’t execute callback in Realm.open either

lib/extensions.js

@@ -48,7 +48,7 @@ module.exports = function(realmConstructor) {
                     if (error) {
                         reject(error);
                     }
-
+                    else {
                         try {
                             let syncedRealm = new this(config);
                             //FIXME: RN hangs here. Remove when node's makeCallback alternative is implemented
@@ -56,6 +56,7 @@ module.exports = function(realmConstructor) {
                         } catch (e) {
                             reject(e);
                         }
+                    }
                 });
             });
         },