In case of multiple request only one error message shown

In case of multiple request only one error message shown

Steps to reproduce:
1. Create env with 2 separate admin networks (multiple cluster networks feature), multinode, Ubuntu/Centos, neutron GRE
2. Create new nodegroup via cli: #fuel --env 1 nodegroup --create --name "group 2"
3. Add nodes from "default" and "group 2" nodegroups into cluster with some roles
4. Select nodes from different nodegroups or just all nodes and click "Configure interfaces"
5. Made some changes and click "Apply"

Actual result:
Appears the message (see the attached screenshot) only about one node from non first node-group.

Expected result:
Message should contains information about all nodes form non default node-group.
See the list of nodes in the cluster:

[root@nailgun ~]# fuel node
id | status | name | cluster | ip | mac | roles | pending_roles | online | group_id
---|----------|-------------------------|---------|------------|-------------------|-------|-----------------|--------|---------
4 | discover | slave-04_compute_cinder | 1 | 10.109.5.4 | 64:4a:a6:be:f2:f6 | | cinder, compute | True | 2
5 | discover | slave-02_compute_cinder | 1 | 10.109.5.3 | 64:59:67:37:86:8b | | cinder, compute | True | 2
2 | discover | slave-03_controller | 1 | 10.109.0.4 | 64:55:e1:21:aa:53 | | controller | True | 1
3 | discover | slave-05_controller | 1 | 10.109.0.5 | 64:6c:3e:8d:ea:43 | | controller | True | 1
1 | discover | slave-01_controller | 1 | 10.109.0.3 | 64:23:df:d9:3c:f0 | | controller | True | 1

VERSION:
  feature_groups:
    - mirantis
  production: "docker"
  release: "8.0"
  openstack_version: "2015.1.0-8.0"
  api: "1.0"
  build_number: "197"
  build_id: "197"
  fuel-nailgun_sha: "8d6ef41f1bef84378a61ee98b46aeb2b925fd10f"
  python-fuelclient_sha: "e685d68c1c0d0fa0491a250f07d9c3a8d0f9608c"
  fuel-agent_sha: "1d98edb0468aa70b9b3a43b8422804e9095e7d9d"
  fuel-nailgun-agent_sha: "b56f832abc18aee9a8c603fd6cc2055c5f4287bc"
  astute_sha: "c8400f51b0b92254da206de55ef89d17fdf35393"
  fuel-library_sha: "33c0fa3aada734dc9e6f315197ce0e4a16f5987c"
  fuel-ostf_sha: "11afd5743a12b1006317d3ca7000d1ede77bdae2"
  fuel-createmirror_sha: "994fed9b1ed889718b61a59733275c08c2dd4c64"
  fuelmenu_sha: "d12061b1aee82f81b3d074de74ea27a6e962a686"
  shotgun_sha: "c377d163519f6d10b69a654019d6086ba5f14edc"
  network-checker_sha: "2c62cd52655ea6456ff6294fd63f18d6ea54fe38"
  fuel-upgrade_sha: "1e894e26d4e1423a9b0d66abd6a79505f4175ff6"
  fuelmain_sha: "22fe551f5525d11a1854fd87dbc8c77fae8fec08"