Error handling when devices not passing the validation

[djs0109]

Describe the bug
When validation of devices fails, the django debug page will be shown.

To Reproduce
Create the device that has duplicated attribute

import requests
import json

url = "http://...:4041/iot/devices"

payload = json.dumps({
  "devices": [
    {
      "timezone": "Europe/London",
      "timestamp": None,
      "endpoint": None,
      "protocol": "IoTA-JSON",
      "transport": "MQTT",
      "explicitAttrs": False,
      "device_id": "device:001",
      "entity_name": "urn:ngsi-ld:Sensor:001",
      "entity_type": "Sensor",
      "attributes": [
        {
          "name": "temperature",
          "type": "Number",
          "object_id": "t"
        },
        {
          "name": "temperature",
          "type": "Number",
          "object_id": "t"
        }
      ],
      "ngsiVersion": "v2"
    }
  ]
})
headers = {
  'fiware-service': 'test',
  'fiware-servicepath': '/',
  'Content-Type': 'application/json'
}

response = requests.request("POST", url, headers=headers, data=payload)

print(response.text)

Then create a project for the same fiware service and open devices module.
You might see the django error pages.

Expected behavior
Ignore the devices that raise the error. Or even give hint about what goes wrong.

[djs0109]

wait next FiLiP release that includes the device validation update