Revert "replace try/except with context managger"

This reverts commit b95b6f0cbb.

rest_framework/viewsets.py

@@ -16,8 +16,6 @@ automatically.
     router.register(r'users', UserViewSet, 'user')
     urlpatterns = router.urls
 """
-
-import contextlib
 from collections import OrderedDict
 from functools import update_wrapper
 from inspect import getmembers
@@ -198,7 +196,7 @@ class ViewSetMixin:
         ]
 
         for action in actions:
-            with contextlib.suppress(NoReverseMatch):
+            try:
                 url_name = '%s-%s' % (self.basename, action.url_name)
                 namespace = self.request.resolver_match.namespace
                 if namespace:
@@ -207,6 +205,9 @@ class ViewSetMixin:
                 url = reverse(url_name, self.args, self.kwargs, request=self.request)
                 view = self.__class__(**action.kwargs)
                 action_urls[view.get_view_name()] = url
+            except NoReverseMatch:
+                pass  # URL requires additional arguments, ignore
+
         return action_urls