Challenges: Fix bug in LeaderboardData Admin (Cloud-CV#2031)

Author: RishabhJain2018

apps/challenges/admin.py

@@ -71,14 +71,14 @@ class LeaderboardAdmin(ImportExportTimeStampedAdmin):
 
 @admin.register(LeaderboardData)
 class LeaderboardDataAdmin(ImportExportTimeStampedAdmin):
-    list_display = ('get_challenge', 'challenge_phase_split', 'submission', 'leaderboard', 'result',)
+    list_display = ('id', 'get_challenge', 'challenge_phase_split', 'submission', 'leaderboard', 'result',)
     list_filter = ('challenge_phase_split', 'created_at', 'modified_at',)
     search_fields = ('challenge_phase_split__challenge_phase__name',
                      'submission__participant_team__team_name', 'leaderboard__schema', 'result',)
 
     def get_challenge(self, obj):
         """Returns challenge name corresponding to leaderboard data entry"""
-        return obj.challenge_phase.challenge
+        return obj.challenge_phase_split.challenge_phase.challenge
     get_challenge.short_description = 'Challenge'
     get_challenge.admin_order_field = 'challenge_phase__challenge'