make team id optional

functions/api/lib/route/route.dart

@@ -13,7 +13,7 @@ class Route implements DbModel {
   final String? _id;
   final List<Point> _points;
   final String _userId;
-  final String _teamId;
+  final String? _teamId;
 
   @override
   String? get id => _id;
@@ -23,10 +23,10 @@ class Route implements DbModel {
 
   Iterable<Point> get points => _points;
   String get userId => _userId;
-  String get teamId => _teamId;
+  String? get teamId => _teamId;
 
 
-  Route({String? id, required List<Point> points, required String userId, required String teamId}) :
+  Route({String? id, required List<Point> points, required String userId, String? teamId}) :
     _id = id,
     _points = points,
     _userId = userId,
@@ -57,7 +57,7 @@ class Route implements DbModel {
       id: getOptionalMapItem(RequestResponseVariables.idFieldName, map),
       points: getRequiredMapItem<Iterable>(pointsRequestResponseFieldName, map).map((e) => Point.fromRequest(e)).toList(growable: false),
       userId: userId,
-      teamId: getRequiredMapItem(teamIdRequestResponseFieldName, map),
+      teamId: getOptionalMapItem(teamIdRequestResponseFieldName, map),
     );
   }
 
@@ -66,7 +66,7 @@ class Route implements DbModel {
       id: getOptionalMapItem(DatabaseVariables.idColumnName, map),
       points: getRequiredMapItem<Iterable>(pointsDbFieldName, map).map((e) => Point.fromDbData(e)).toList(growable: false),
       userId: getRequiredMapItem(userIdDbFieldName, map),
-      teamId: getRequiredMapItem(teamIdDbFieldName, map),
+      teamId: getOptionalMapItem(teamIdDbFieldName, map),
     );
   }
 }