Explain why datasets are ignored from category tree

convert.py

@@ -404,10 +404,18 @@ def toc_element_to_category_tree(xml_element, dataset_json_stubs, dataset_codes_
     ):
         dataset_code = xml_element.findtext("{*}code")
         if dataset_code not in dataset_codes_to_convert:
+            log.debug(
+                "Ignoring the dataset %r from the category tree because it was not requested to be converted",
+                dataset_code,
+            )
             return None
 
         dataset_url = xml_element.findtext("{*}downloadLink[@format='sdmx']")
         if not dataset_url:
+            log.debug(
+                "Ignoring the dataset %r from the category tree because it does not provide a SDMX download link",
+                dataset_code,
+            )
             return None
 
         dataset_name = xml_element.findtext("{*}title[@language='en']")