ListObjectsV2Metadata: userMetadata null check (#844)

Author: kannappanr

src/main/xml-parsers.js

@@ -323,7 +323,12 @@ export function parseListObjectsV2WithMetadata(xml) {
         .replace(/^"/g, '').replace(/"$/g, '')
         .replace(/^"/g, '').replace(/^"$/g, '')
       var size = +content.Size[0]
-      var metadata = content.UserMetadata[0]
+      var metadata
+      if (content.UserMetadata != null) {
+        metadata = content.UserMetadata[0]
+      } else {
+        metadata = null
+      }
       result.objects.push({name, lastModified, etag, size, metadata})
     })
   }