feat: Kingfisher Process now expects kingfisher_process_expected_file…

…s_count to equal the number of non-error messages

kingfisher_scrapy/extensions/kingfisher_process_api2.py

@@ -173,8 +173,9 @@ def item_scraped(self, item, spider):
         cb = functools.partial(self._when_ready, self.client.publish, data, self.routing_key)
         methods.add_callback_threadsafe(self.client.connection, cb)
 
-        # WARNING! Kingfisher Process's API reads this value.
-        self.stats.inc_value("kingfisher_process_expected_files_count")
+        if not isinstance(item, FileError):
+            # WARNING! Kingfisher Process's API reads this value.
+            self.stats.inc_value("kingfisher_process_expected_files_count")
 
     def disconnect_and_join(self):
         """Close the RabbitMQ connection and join the client's thread."""