fix more linting errors

mirrulations-extractor/src/mirrextractor/extractor.py

@@ -122,11 +122,11 @@ def update_stats():
                     .make_attachment_save_path(complete_path)
                 if not os.path.isfile(output_path):
                     # Write an empty file.  The extract_text method sometimes
-                    # fails with an out-of-memory error if the file is too 
-                    # large, and a restart would try again.  This ensures 
-                    # that the extraction is not attempted again when the 
+                    # fails with an out-of-memory error if the file is too
+                    # large, and a restart would try again.  This ensures
+                    # that the extraction is not attempted again when the
                     # extractor process is restarted (by Docker).
-                    with open(output_path, 'w') as f: 
+                    with open(output_path, 'w') as f:
                         pass
                     start_time = time.time()
                     Extractor.extract_text(complete_path, output_path)