Error property should not be set if it is empty

$result->error is currently always set, even when no error occurred. This is not according to the functions definitions.

Index: chr.module
===================================================================
--- chr.module  (revision 3133)
+++ chr.module  (working copy)
@@ -225,6 +225,9 @@
     $result->code = $result->errno;
     return $result;
   }
+  else {
+    unset($result->error);
+  }

   // The last effective URL should correspond to the Redirect URL.
   $result->redirect_url = curl_getinfo($ch, CURLINFO_EFFECTIVE_URL);