MetricsCollector incorrectly counts serverBatches, so the sending process seem to not have finished

...
{  
      "id":"f46a6560-dddc-46a4-a84c-f078fec67477",
      "pushApplicationId":"9cacb7b4-ec19-4f4d-a15d-b3c9ba4bfd22",
      "rawJsonMessage":"{\"alert\":\"erg\",\"criteria\":{\"categories\":null,\"variants\":null,\"alias\":null,\"deviceType\":null},\"config\":{\"ttl\":-1}}",
      "ipAddress":"127.0.0.1",
      "clientIdentifier":"AeroGear UnifiedPush Console",
      "submitDate":1433501113730,
      "totalReceivers":4,
      "appOpenCounter":0,
      "firstOpenDate":null,
      "lastOpenDate":null,
      "servedVariants":2,
      "totalVariants":4,
      "variantInformations":[  
         {  
            "id":"94a2b46a-34ec-4d6b-8576-34789cdece02",
            "variantID":"9a734c0d-fec5-49da-aad7-7f12f298481e",
            "receivers":0,
            "deliveryStatus":true,
            "reason":null,
            "variantOpenCounter":0,
            "servedBatches":0,
            "totalBatches":0
         },
         {  
            "id":"89fd61f8-bdb8-409a-b029-73a2d3b6ed29",
            "variantID":"3d5b774a-7ffc-4971-8bb6-e12f9058b8ff",
            "receivers":1,
            "deliveryStatus":false,
            "reason":"Error sending payload to GCM server",
            "variantOpenCounter":0,
            "servedBatches":1,
            "totalBatches":1
         },
         {  
            "id":"34f939aa-c8ab-4159-84ff-ace8f5f64e02",
            "variantID":"24f017c9-9d0b-4160-acdf-47396ff25b27",
            "receivers":4,
            "deliveryStatus":false,
            "reason":"Error delivering SimplePush payload",
            "variantOpenCounter":0,
            "servedBatches":1,
            "totalBatches":1
         },
         {  
            "id":"f78b95a8-8a42-4933-97e2-1c11c4612089",
            "variantID":"f5c69cba-047d-48f8-8b72-d3c6b89ce56e",
            "receivers":0,
            "deliveryStatus":true,
            "reason":null,
            "variantOpenCounter":0,
            "servedBatches":0,
            "totalBatches":0
         }
      ]
   },
...