url function refactoring

Author: libargutxi

src/cs_dynamicpages/content/dynamic_page_row.py

@@ -78,5 +78,7 @@ def render(self, request):
 
     def url(self):
         """Returns the url with link variables replaced."""
+        if not self.link_url:
+            return ""
         url = replace_link_variables_by_paths(self, self.link_url.strip())
         return absolute_target_url(url)

src/cs_dynamicpages/content/dynamic_page_row_featured.py

@@ -36,5 +36,7 @@ def related_image_object(self):
 
     def url(self):
         """Returns the url with link variables replaced."""
+        if not self.link_url:
+            return ""
         url = replace_link_variables_by_paths(self, self.link_url.strip())
         return absolute_target_url(url)