Error when a course access is restricted

[thangnbn]

Describe the bug

Several courses at my institution have access restricted after the semester. When a course is restricted, my access token doesn't have permission to get course details. This results in an AttributeError when trying to instantiate a Course object.

$ curl -H "Authorization: Bearer <my access token>" "<my institution url>/api/v1/courses" | jq .
[
  {
    // this course I can access
    // the course details are listed here
  },
  {
    // this course I cannot access
    "id": 77520000000029520,
    "access_restricted_by_date": true
  },
...
]

>>> from canvasapi import Canvas
>>> API_URL = "my institution url"
>>> API_KEY = "my access key" 
>>> canvas = Canvas(API_URL, API_KEY)
>>> courses = canvas.get_courses() 
>>> for course in courses:
...     print(course)

[course 1 name]
Traceback (most recent call last):
  File "<stdin>", line 2, in <module>
  File "D:\Repos\unified-deadline\venv\Lib\site-packages\canvasapi\course.py", line 46, in __str__
    return "{} {} ({})".format(self.course_code, self.name, self.id)
                               ^^^^^^^^^^^^^^^^
  File "D:\Repos\unified-deadline\venv\Lib\site-packages\canvasapi\canvas_object.py", line 14, in __getattribute__
    return super(CanvasObject, self).__getattribute__(name)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'Course' object has no attribute 'course_code'

Expected behavior

I think the wrapper should either ignore restricted courses or have a special model for them.

Environment information

• Python version: 3.11.2
• CanvasAPI version: 3.0.0

[bennettscience]

This came up in a recent discussion (#604) and the best way to avoid this is to request only active courses using the enrollment_state keyword.

I'm not sure I'd call this a bug, maybe an enhancement tag would be a better fit.