Don't need to || null, it'll be undefined

Author: mattrobenolt

lib/client.js

@@ -30,7 +30,7 @@ var Client = function Client(dsn, options) {
     this.transport = options.transport || transports[this.dsn.protocol];
 
     this.loggerName = options.logger || '';
-    this.dataCallback = options.dataCallback || null;
+    this.dataCallback = options.dataCallback;
 
     // enabled if a dsn is set
     this._enabled = !!this.dsn;