Merge pull request #221 from PassTheMayo/patch-1

Fixed unnecessary logging when document not found

lib/document_stores/rethinkdb.js

@@ -35,7 +35,7 @@ class RethinkDBStore {
     this.client.table('uploads').get(md5(key)).run((error, result) => {
       if (error || !result) {
         callback(false);
-        winston.error('failed to insert to table', error);
+        if (error) winston.error('failed to insert to table', error);
         return;
       }
       callback(result.data);