fix meta title crash

shared/models/main.py

@@ -93,6 +93,9 @@ class ExtendedMetadataHomePageMixin(models.Model):
         abstract = True
 
     def get_meta_title_suffix(self):
+        if not hasattr(self, "root_page") or not hasattr(self.root_page, "meta_title_suffix"):
+            return ""
+            
         if self.root_page.meta_title_suffix:
             return self.root_page.meta_title_suffix
 
@@ -123,6 +126,9 @@ class ExtendedMetadataPageMixin(models.Model):
         abstract = True
 
     def get_meta_title_suffix(self):
+        if not hasattr(self, "root_page") or not hasattr(self.root_page, "meta_title_suffix"):
+            return ""
+
         if self.root_page.meta_title_suffix:
             return self.root_page.meta_title_suffix