Fix vim25:InvalidRequest when no profiles exist

Currently, we don't check if there are any existing profiles in
pbm.get_all_profiles. As a result, we send a malformed request to
PBMRetrieveContent resulting in vim25:InvalidRequest.

Change-Id: I882c97a8050f8c2d49a4ce1de0f166e457ce68f2
Closes-Bug: #1302271

oslo/vmware/pbm.py

@@ -83,16 +83,18 @@ def get_all_profiles(session):
     profile_manager = pbm.service_content.profileManager
     res_type = pbm.client.factory.create('ns0:PbmProfileResourceType')
     res_type.resourceType = 'STORAGE'
-
+    profiles = []
     profile_ids = session.invoke_api(pbm,
                                      'PbmQueryProfile',
                                      profile_manager,
                                      resourceType=res_type)
     LOG.debug(_("Fetched profile IDs: %s."), profile_ids)
-    return session.invoke_api(pbm,
+    if profile_ids:
+        profiles = session.invoke_api(pbm,
                                       'PbmRetrieveContent',
                                       profile_manager,
                                       profileIds=profile_ids)
+    return profiles
 
 
 def get_profile_id_by_name(session, profile_name):

tests/test_pbm.py

@@ -47,6 +47,18 @@ class PBMUtilityTest(base.TestCase):
         pbm.get_all_profiles(session)
         self.assertEqual(2, session.invoke_api.call_count)
 
+    def test_get_all_profiles_with_no_profiles(self):
+        session = mock.Mock()
+        session.pbm = mock.Mock()
+        session.invoke_api.return_value = []
+        profiles = pbm.get_all_profiles(session)
+        session.invoke_api.assert_called_once_with(
+            session.pbm,
+            'PbmQueryProfile',
+            session.pbm.service_content.profileManager,
+            resourceType=session.pbm.client.factory.create())
+        self.assertEqual([], profiles)
+
     def _create_profile(self, profile_id, name):
         profile = mock.Mock()
         profile.profileId = profile_id