Environment

How do you use Sentry?
Self-hosted, version 21.2.0

Which SDK and version?
Python 1.0.0

Steps to Reproduce

1. Set up performance tracing for a Django application
2. Send performance data for a view which is a subclass of TemplateView
3. View the performance information for the view in Sentry

Expected Result

Sentry accepts all of the submitted performance data.

Actual Result

The following alert appears above the performance information:

This is caused by #957.

At https://github.com/Christophe31/sentry-python/blob/db2d87e503b0178a7d56bdedb00db19ac6ddc9d8/sentry_sdk/integrations/django/templates.py#L60, a span is created with the description self.template_name. If the TemplateResponse was created by a Django TemplateView, template_name will be a list, not a string.

A similar error can occur with django.shortcuts.render, but I don't use it, so I haven't experienced the issue there.