fix email preferences check after core changes

SDBELGA-818

server/features/planning.feature

@@ -777,7 +777,7 @@ Feature: Planning
         }
         """
         When we get "activity"
-        Then we get list with 3 items
+        Then we get list with 4 items
         """
         {"_items":[
             {

server/planning/assignments/assignments.py

@@ -68,6 +68,7 @@
 from apps.content import push_content_notification
 from .assignments_history import ASSIGNMENT_HISTORY_ACTIONS
 from planning.utils import get_event_formatted_dates, get_formatted_contacts
+from superdesk.preferences import get_user_notification_preferences
 
 logger = logging.getLogger(__name__)
 planning_type = deepcopy(superdesk.Resource.rel("planning", type="string"))
@@ -345,12 +346,15 @@ def send_assignment_notification(self, updates, original=None, force=False):
             return
 
         assigned_to = updates.get("assigned_to", {})
+        assigned_to_user = None
+
+        if assigned_to.get("user"):
+            assigned_to_user = get_resource_service("users").find_one(req=None, _id=assigned_to.get("user"))
 
         # No assignment notification sent, if user is not enabled assignment notification
-        if assigned_to.get("user") and not superdesk.get_resource_service(
-            "preferences"
-        ).check_preference_email_notification_is_enabled("assignments", user_id=assigned_to.get("user")):
+        if assigned_to_user and get_user_notification_preferences(assigned_to_user, "assignments")["email"] is False:
             return
+
         assignment_id = updates.get("_id") or assigned_to.get("assignment_id", "Unknown")
         if not original:
             original = {}
@@ -378,7 +382,6 @@ def send_assignment_notification(self, updates, original=None, force=False):
                 )
 
         if assignee is None and assigned_to.get("user"):
-            assigned_to_user = get_resource_service("users").find_one(req=None, _id=assigned_to.get("user"))
             if assigned_to_user and assigned_to_user.get("slack_username"):
                 assignee = "@" + assigned_to_user.get("slack_username")
             else: