added upsert to permissions

dbhandler/mongo/servers_authorization.go

@@ -52,7 +52,7 @@ func (self *ServersAuthorizationDbHandler) AddPermissions(ctx context.Context, u
 			"server_id": serverId,
 		},
 	).Decode(&serverPermissions)
-	if err != nil {
+	if err != nil && err != mongo.ErrNoDocuments {
 		return err
 	}
 
@@ -120,6 +120,7 @@ func (self *ServersAuthorizationDbHandler) SetPermissions(ctx context.Context, u
 				"permissions": permissions,
 			},
 		},
+		options.Update().SetUpsert(true),
 	)
 
 	return err