[DAV] Fix unknown handling

aleksis/core/util/dav_handler/base.py

@@ -75,11 +75,7 @@ class ElementHandler(RegistryObject, is_registry=True):
                 response.handle_unknown(self.name)
 
         for child in self.children:
-            if child is not None:
-                child.process(stage, base, response)
-            else:
-                if stage == "xml":
-                    response.handle_unknown(name)
+            child.process(stage, base, response)
 
         base.current_xml = previous_xml
 
@@ -229,9 +225,9 @@ class NotImplementedObject:
     def __init__(self, xml_sub):
         self.xml_sub = xml_sub
 
-
-    def process(self, stage, base, response = None):
-        pass
+    def process(self, stage, base, response=None):
+        if stage == "xml" and response is not None:
+            response.handle_unknown(self.xml_sub)
 
 
 class NotFoundObject:
@@ -327,10 +323,7 @@ class QueryBase:
 
             base.current_xml = response.propstats[200]
             for child in self.children:
-                if child is not None:
-                    child.process(stage, base, response)
-                elif stage == "xml":
-                    response.handle_unknown(name)
+                child.process(stage, base, response)
 
         base.current_xml = previous_xml