Remove `None` as a redundant argument to dict.get()

`dict.get()` returns `None` by default, if a key wasn't found.
Removing `None` as second argument to avoid redundancy.

Change-Id: I92fe515c0f920a324ac7dd85577d7ee25a6f20a0

manila/api/v1/share_manage.py

@@ -36,9 +36,9 @@ class ShareManageMixin(object):
         # DB layers for 'name' and 'description' API params that are
         # represented in DB as 'display_name' and 'display_description'
         # appropriately.
-        name = share_data.get('display_name', share_data.get('name', None))
+        name = share_data.get('display_name', share_data.get('name'))
         description = share_data.get(
-            'display_description', share_data.get('description', None))
+            'display_description', share_data.get('description'))
 
         share = {
             'host': share_data['service_host'],

manila/api/v2/share_types.py

@@ -141,7 +141,7 @@ class ShareTypesController(wsgi.Controller):
             share_type = body['share_type']
         else:
             share_type = body['volume_type']
-        name = share_type.get('name', None)
+        name = share_type.get('name')
         specs = share_type.get('extra_specs', {})
         is_public = share_type.get(
             'os-share-type-access:is_public',

manila/scheduler/drivers/filter.py

@@ -65,7 +65,7 @@ class FilterScheduler(base.Scheduler):
         In the event that the request gets re-scheduled, this entry
         will signal that the given backend has already been tried.
         """
-        retry = filter_properties.get('retry', None)
+        retry = filter_properties.get('retry')
         if not retry:
             return
         hosts = retry['hosts']
@@ -278,7 +278,7 @@ class FilterScheduler(base.Scheduler):
         if not exc:
             return  # no exception info from a previous attempt, skip
 
-        hosts = retry.get('hosts', None)
+        hosts = retry.get('hosts')
         if not hosts:
             return  # no previously attempted hosts, skip
 
@@ -388,7 +388,7 @@ class FilterScheduler(base.Scheduler):
         """
         elevated = context.elevated()
 
-        shr_types = request_spec.get("share_types", None)
+        shr_types = request_spec.get("share_types")
 
         weighed_hosts = []
 

manila/scheduler/filters/retry.py

@@ -25,7 +25,7 @@ class RetryFilter(base_host.BaseHostFilter):
 
     def host_passes(self, host_state, filter_properties):
         """Skip nodes that have already been attempted."""
-        retry = filter_properties.get('retry', None)
+        retry = filter_properties.get('retry')
         if not retry:
             # Re-scheduling is disabled
             LOG.debug("Re-scheduling is disabled")