fix graphql errors in notifications

api/typeDefs/item.js

@@ -159,7 +159,7 @@ export default gql`
     remote: Boolean
     sub: Sub
     subName: String
-    status: String
+    status: String!
     uploadId: Int
     otsHash: String
     parentOtsHash: String

api/typeDefs/sub.js

@@ -31,7 +31,7 @@ export default gql`
   }
 
   type Sub {
-    name: ID!
+    name: String!
     createdAt: Date!
     userId: Int!
     user: User!

api/typeDefs/user.js

@@ -49,7 +49,7 @@ export default gql`
   type User {
     id: ID!
     createdAt: Date!
-    name: String
+    name: String!
     nitems(when: String, from: String, to: String): Int!
     nposts(when: String, from: String, to: String): Int!
     nterritories(when: String, from: String, to: String): Int!