let categories have no page associated

fgs/datatypes.py

@@ -454,10 +454,11 @@ class Link:
         if self.type == "slug":
             return self.page.category
         elif self.type == "tag":
-            if self.tag.is_category:
-                return self.tag
-            else:
-                raise Exception("category can only be called on category tags")
+            return self.tag
+            #if self.tag.is_category:
+            #    return self.tag
+            #else:
+            #    raise Exception("category can only be called on category tags")
         else:
             raise Exception("category is not allowed to be called here")
     category = property(get_category, None, None)