BenchmarkProcessor should not be mandatory

[jnadeu]

The minimal snapshot data accepted is the following:

{
  "type": "Snapshot",
  "uuid": "8af14426-9ec5-4dab-b35a-3768ce875efb",
  "version": "1.0",
  "software": "Workbench",
  "elapsed": 0,
  "device": {
    "type": "Desktop",
    "chassis": "Microtower",
    "serialNumber": "x10s",
    "model": "x10ml",
    "manufacturer": "x10mr"
  },
  "components": [
    {
      "type": "RamModule",
      "serialNumber": "rm22s",
      "model": "rm22ml",
      "manufacturer": "rm22mr"
    },
    {
      "type": "Processor",
      "serialNumber": "p22s",
      "model": "p22ml",
      "manufacturer": "p22mr",
      "actions": [
        {
          "type": "BenchmarkProcessor",
          "rate": 0,
          "elapsed": 0
        }
      ]
    }
  ]
}