fixed sigabrt on android

CustomModels/usermodel.cpp

@@ -30,7 +30,7 @@ UserModel::UserModel( QObject *parent ): QAbstractListModel( parent )
 int UserModel::rowCount( const QModelIndex &parent ) const
 {
     Q_UNUSED( parent );
-    int count = userMap.values( current ).toSet().count();
+    int count = userMap.values( current ).count();
     qDebug() << "count  of current channel users" << count;
     return count;
 }