send null instead of unknown

ygopro-server.coffee

@@ -845,9 +845,9 @@ class Room
         @start_time = end_time
       if score_array.length != 2
         if !score_array[0]
-          score_array[0] = { name: "unknown_player1", score: -5 }
+          score_array[0] = { name: null, score: -5 }
         if !score_array[1]
-          score_array[1] = { name: "unknown_player2", score: -5 }
+          score_array[1] = { name: null, score: -5 }
         score_array[0].score = -5
         score_array[1].score = -5
       request.post { url : settings.modules.arena_mode.post_score , form : {

ygopro-server.js

@@ -1084,13 +1084,13 @@
         if (score_array.length !== 2) {
           if (!score_array[0]) {
             score_array[0] = {
-              name: "unknown_player1",
+              name: null,
               score: -5
             };
           }
           if (!score_array[1]) {
             score_array[1] = {
-              name: "unknown_player2",
+              name: null,
               score: -5
             };
           }