Django -“类型错误:预期的字符串或类似字节的对象”

I'm using Cloudinary in my Django application to store and serve images that users upload in one view of my site. The images are getting uploaded and shown correctly; however, in my UpdateView when a user checks 'clear' to remove the previous image and then submits the form this error is shown:I'm using Cloudinary in my Django application t