[ISSUE] Group members list returns null if no members are found in a scope #211

Description
While using SDK getting groups or a group and trying to access members if there aren't any members assigned into this group.

Reproduction

1. Create a WorkspaceClient
2. Group group=workspaceClient.get().groups().get("group_id");
3. group.getMembers();

Expected behavior
The expected behavior here would be an empty list so you can add members if needed.

Additional context
Add any other context about the problem here.