fix attr check

Author: brandonzorn

nlightreader/widgets/NlightTemplates/Info.py

@@ -252,7 +252,7 @@ def open_reader(self):
         finally:
             selected_chapter = self._get_selected_chapter()
             if selected_chapter:
-                if selected_chapter.__getattribute__("url"):
+                if hasattr(selected_chapter, "url"):
                     from render_html import render_in_browser
                     render_in_browser(
                         f"""