Stop software_deployments from passing empty keys

When software_deployments was given a body missing the "input_values"
field it would pass update info with input_values=None, which would
later fail and cause an internal server error.

This change prevents software_deployments from passing on NoneType
values.

Change-Id: I02e9c08bbd7429d808de1451de12cc02fc879ecb
Closes-Bug: 1319825

heat/api/openstack/v1/software_deployments.py

@@ -85,7 +85,8 @@ class SoftwareDeploymentController(object):
         """
         update_data = dict((k, body.get(k)) for k in (
             'config_id', 'input_values', 'output_values', 'action',
-            'status', 'status_reason'))
+            'status', 'status_reason')
+            if body.get(k, None) is not None)
         sd = self.rpc_client.update_software_deployment(req.context,
                                                         deployment_id,
                                                         **update_data)