[bisq-network/bisq-markets] If risq backend is unavailable, /api/volumes returns incorrect JSON data structure (#24)

[wiz]

Risq returning 200
```
[
  {
    "volume": "1.39170000",
    "num_trades": 4,
    "period_start": "2016-04-19T00:00:00+00:00"
  },
```

Risq returning 503
```
{
  "data": {
    "volumes": [
      {
        "period_start": "1461024000",
        "periodStartDateTime": "2016-04-19T00:00:00+00:00",
        "volume": "1.39170000",
        "num_trades": 4.0
      },
```

@bodymindarts are you available to fix this or shall I have a crack at it?

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