[2.0.x] Fixed #28837 -- Fixed test client crash if an exception with more than one arg is raised.

Also removed usage of the problematic pattern elsewhere.

Regression in 6e55e1d88a.

Backport of 746caf3ef8 from master

tests/test_client/views.py

@@ -331,3 +331,12 @@ def django_project_redirect(request):
 def upload_view(request):
     """Prints keys of request.FILES to the response."""
     return HttpResponse(', '.join(request.FILES))
+
+
+class TwoArgException(Exception):
+    def __init__(self, one, two):
+        pass
+
+
+def two_arg_exception(request):
+    raise TwoArgException('one', 'two')