Fix various sonarcloud issues

This fixes various reported bugs through sonarcloud at:
https://sonarcloud.io/project/issues?id=Rodney-Reis_ansible&resolved=false&types=BUG

contrib/inventory/gce.py

@@ -1,20 +1,7 @@
 #!/usr/bin/env python
-# Copyright 2013 Google Inc.
-#
-# This file is part of Ansible
-#
-# Ansible is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# Ansible is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
+
+# Copyright: (c) 2013, Google Inc.
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
 
 '''
 GCE external inventory script
@@ -498,7 +485,7 @@ class GceInventory(object):
             else:
                 groups[machine_type] = [name]
 
-            image = node.image and node.image or 'persistent_disk'
+            image = node.image or 'persistent_disk'
             if image in groups:
                 groups[image].append(name)
             else: