Remove unused error object

spacy/language.py

@@ -784,14 +784,6 @@ class Language:
                 factory_name, source, name=name
             )
         else:
-            if not self.has_factory(factory_name):
-                err = Errors.E002.format(
-                    name=factory_name,
-                    opts=", ".join(self.factory_names),
-                    method="add_pipe",
-                    lang=util.get_object_name(self),
-                    lang_code=self.lang,
-                )
             pipe_component = self.create_pipe(
                 factory_name,
                 name=name,