fix supportedsites.py for modules without docstring

(fixes #1332)

.github/workflows/tests.yml

@@ -39,6 +39,6 @@ jobs:
         pip install nose
         make test
 
-    - name: Generate man pages and bash/zsh completion
+    - name: Test autogeneration of man pages, bash/zsh completion, etc
       run: |
-        make man completion
+        make

gallery_dl/extractor/cyberdrop.py

@@ -1,3 +1,11 @@
+# -*- coding: utf-8 -*-
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 as
+# published by the Free Software Foundation.
+
+"""Extractors for https://cyberdrop.me/"""
+
 import base64
 
 from .common import Extractor, Message

scripts/supportedsites.py

@@ -212,9 +212,12 @@ IGNORE_LIST = (
 
 def domain(cls):
     """Return the web-domain related to an extractor class"""
-    url = sys.modules[cls.__module__].__doc__.split()[-1]
-    if url.startswith("http"):
-        return url
+    try:
+        url = sys.modules[cls.__module__].__doc__.split()[-1]
+        if url.startswith("http"):
+            return url
+    except Exception:
+        pass
 
     if hasattr(cls, "root") and cls.root:
         return cls.root + "/"