fixed crashing on linking to nonexisting pages

fgs/datatypes.py

@@ -98,6 +98,10 @@ class Page:
         self._config = None
         self._factories = factories
         self.initialized = False
+        self.status = "uninitialized"
+        self.title = "N/A"
+        self._metadata = {}
+        self.content = []
 
     def init(self, filename, subpath, raw, metadata, content, title, category, date_created, date_modified, authors, last_modification_author, status):
         self.initialized = True