Improve handling for authors without authorUrl (mostly for teststory).

calibre-plugin/fff_plugin.py

@@ -1985,7 +1985,8 @@ class FanFicFarePlugin(InterfaceAction):
 
             author_id_to_link_map = dict()
             for i, author in enumerate(authorlist):
-                author_id_to_link_map[authorids[author]] = authurls[i]
+                if len(authurls) > i:
+                    author_id_to_link_map[authorids[author]] = authurls[i]
 
             # print("author_id_to_link_map:%s\n\n"%author_id_to_link_map)
             db.new_api.set_link_for_authors(author_id_to_link_map)

fanficfare/story.py

@@ -683,7 +683,7 @@ class Story(Configurable):
             htmllist=[]
             for i, v in enumerate(self.getList('author')):
                 if len(self.getList('authorUrl')) <= i:
-                    aurl = "no_author_link"
+                    aurl = None
                 else:
                     aurl = self.getList('authorUrl')[i]
                 auth = v