Let null scores be omitted.

models/contest_player.js

@@ -44,7 +44,7 @@ let model = db.define('contest_player', {
         fields: ['user_id'],
       }
     ]
-});
+  });
 
 let Model = require('./common');
 class ContestPlayer extends Model {
@@ -102,6 +102,7 @@ class ContestPlayer extends Model {
 
         this.score = 0;
         for (let x in this.score_details) {
+          if (this.score != null)
             this.score += this.score_details[x].score;
         }
       }
@@ -115,6 +116,7 @@ class ContestPlayer extends Model {
 
       this.score = 0;
       for (let x in this.score_details) {
+        if (this.score != null)
           this.score += this.score_details[x].score;
       }
     } else if (this.contest.type === 'acm') {
@@ -132,7 +134,7 @@ class ContestPlayer extends Model {
         this.score_details[judge_state.problem_id].submissions[judge_state.id] = {
           judge_id: judge_state.id,
           accepted: judge_state.status === 'Accepted',
-          compiled: judge_state.status !== 'Compile Error',
+          compiled: judge_state.score != null,
           time: judge_state.submit_time
         };