Minor update

Author: Cimon Lucas (LCM)

image_preview_thumbnailer.py

@@ -148,7 +148,8 @@ def process_link(img_downloader, anchor_tag, url_match, config=PluginConfig()):
         LOGGER.info("Thumbnail does not exist for %s => downloading image from %s", thumb_filename, anchor_tag['href'])
         tmp_thumb_filepath = img_downloader(url_match, config)
         if not tmp_thumb_filepath:  # => means the downloader failed to retrieve the image in a "supported" case
-            with open(config.fs_thumbs_dir(thumb_filename + '.none'), 'w', encoding='utf8'):
+            hostname = urlparse(anchor_tag['href']).netloc
+            with open(config.fs_thumbs_dir(f'{thumb_filename}.{hostname}.none'), 'w', encoding='utf8'):
                 pass
             return
         img_ext = os.path.splitext(tmp_thumb_filepath)[1]