2.3.2: Fixed error on receiving receipts from groups

Author: Bjornskjald

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "libfb",
-  "version": "2.3.1",
+  "version": "2.3.2",
   "description": "Facebook MQTT library for Node.js",
   "repository": "https://github.com/ChatPlug/libfb-js",
   "main": "dist/index.js",

package.json

@@ -43,7 +43,7 @@ export default function parseDeltaEvent (event: any): { type: EventType, event:
       type: 'deliveryReceiptEvent',
       event: {
         threadId: getThreadId(delta),
-        receiverId: delta.actorFbId.toString() || getThreadId(delta)
+        receiverId: delta.actorFbId ? delta.actorFbId.toString() : getThreadId(delta)
       } as DeliveryReceiptEvent
     }
   }
@@ -54,7 +54,7 @@ export default function parseDeltaEvent (event: any): { type: EventType, event:
       type: 'readReceiptEvent',
       event: {
         threadId: getThreadId(delta),
-        receiverId: delta.actorFbId.toString() || getThreadId(delta)
+        receiverId: delta.actorFbId ? delta.actorFbId.toString() : getThreadId(delta)
       } as ReadReceiptEvent
     }
   }