Fix for issue in iOS client SDK.
Problem : If the number of top scores on server is less than 10, the client SDK crashes on loadScoresWithCompletionHandler hitting an assertion assert(scores_);
Root Cause : When a user posted his/her score to the server, the server tries to send top 10 scores to the client as well. Because the usage pattern of the client SDK is to post score, and then get top scores, the server tries to send top 10 scores as a reply of request to post score.
However, the client SDK did not set scores_ at all if the number of scores received from the server was less than 10.
Fix : Set scores_ variable in loadScoresWithCompletionHandler function even though the number of scores received from server is less than 10.
Test done : Reproed the issue, verified that the code fixed the issue.