Handle bad URIs when filtering redirects

rails/rails#51131 introduced parameter filtering for redirects. We
didn't account for invalid URIs though, and it changes the behaviour of
redirect_to to raise URI errors when we try to filter a bad URI.
Instead, we should fallback to filtering bad URIs entirely to preserve behaviour.

actionpack/lib/action_dispatch/http/filter_redirect.rb

@@ -42,6 +42,8 @@ module ActionDispatch
           end
         end
         uri.to_s
+      rescue URI::Error
+        FILTERED
       end
     end
   end

actionpack/test/controller/log_subscriber_test.rb

@@ -36,6 +36,10 @@ module Another
       redirect_to "http://secret.foo.bar?username=repinel&password=1234"
     end
 
+    def filterable_redirector_bad_uri
+      redirect_to " s:/invalid-string0uri"
+    end
+
     def data_sender
       send_data "cool data", filename: "file.txt"
     end
@@ -296,6 +300,16 @@ class ACLogSubscriberTest < ActionController::TestCase
     assert_equal "Redirected to http://secret.foo.bar?username=repinel&password=[FILTERED]", logs[1]
   end
 
+  def test_filter_redirect_bad_uri
+    @request.env["action_dispatch.parameter_filter"] = [/pass.+/]
+
+    get :filterable_redirector_bad_uri
+    wait
+
+    assert_equal 3, logs.size
+    assert_equal "Redirected to [FILTERED]", logs[1]
+  end
+
   def test_send_data
     get :data_sender
     wait