This pull request fixes issues with submission format unmatching in 0.3.0 and 0.4.2

[thehir0]

RuTie in 0.3.0:

{
    "data": {
        "test": [
            [
                {
                    "outputs": "1",
                    "meta": {
                        "dialog_id": 0,
                        "question_id": 0
                    }
                },

RuTie in 0.4.2

{
    "data": {
        "test": [
            [
                {
                    "outputs": {
                        "outputs": "1",
                        "meta": {
                            "id": 0
                        }
                    },
                    "meta": {
                        "dialog_id": 0,
                        "question_id": 0
                    }
                },

RuHumanEval in 0.3.0

{
    "data": {
        "test": [
            {
                "outputs": [
                    [
                        null,
                        null,
                        null,
                        null,
                        null,
                        null,
                        null,
                        null,
                        null,
                        null
                    ],
                    [
                        null,
                        null,
                        null,
                        null,
                        null,
                        null,
                        null,
                        null,
                        null,
                        null
                    ],

RuHumanEval in 0.4.2(Has double squared brackets in outputs)

{
    "data": {
        "test": [
            {
                "outputs": [
                    [
                        [
                            "None",
                            "None",
                            "None",
                            "None",
                            "None",
                            "None",
                            "None",
                            "None",
                            "None",
                            "None"
                        ],
                        [
                            "None",
                            "None",
                            "None",
                            "None",
                            "None",
                            "None",
                            "None",
                            "None",
                            "None",
                            "None"
                        ],
                        [

[thehir0]

Without this fix: i get 0.0 ruTie and 0/1/1 ruHumanEval on submission page.