Log warning if an entry has no pages

Author: object-Object

src/hexdoc/patchouli/entry.py

@@ -130,6 +130,10 @@ def _skip_disabled_pages(self):
                 )
                 continue
             new_pages.append(page)
+        if not new_pages:
+            logger.warning(
+                f"Entry has no pages{' after applying flags' if self.pages else ''}: {self.id}"
+            )
         self.pages = new_pages
         return self