Update files from the datasets library (from 1.0.2)

Release notes: https://github.com/huggingface/datasets/releases/tag/1.0.2

wiki_dpr.py

@@ -155,7 +155,7 @@ class WikiDpr(datasets.GeneratorBasedBuilder):
                     {"embeddings_index": os.path.join(_INDEX_URL, self.config.index_file.format(split=split))}
                 )
                 return downloaded_resources["embeddings_index"]
-            except ConnectionError:  # index doesn't exist
+            except (FileNotFoundError, ConnectionError):  # index doesn't exist
                 pass
 
     def _post_process(self, dataset, resources_paths):