fix: repo stat for string values

Author: Pedro Santos

src/repo/stat.js

@@ -5,11 +5,11 @@ const Big = require('bignumber.js')
 
 const transform = function (res, callback) {
   callback(null, {
-    numObjects: new Big(res.NumObjects),
-    repoSize: new Big(res.RepoSize),
+    numObjects: res.NumObjects,
+    repoSize: isNaN(res.RepoSize) ? res.RepoSize : new Big(res.RepoSize),
     repoPath: res.RepoPath,
     version: res.Version,
-    storageMax: new Big(res.StorageMax)
+    storageMax: isNaN(res.StorageMax) ? res.StorageMax : new Big(res.StorageMax)
   })
 }