Catch error if child handle record cannot be retrieved.

landingpage/landingpageapp/handle/cmip6parser.py

@@ -303,10 +303,22 @@ def _get_list_of_parts_records_from_record(record):
     list_to_be_returned = []
     any_replaced = False
     for handle in list_of_parts_handles:
-        info, replaced = _extract_info_on_one_part_record(handle)
-        list_to_be_returned.append(info)
-        if replaced:
-            any_replaced = True
+        try:
+            info, replaced = _extract_info_on_one_part_record(handle)
+            list_to_be_returned.append(info)
+            if replaced:
+                any_replaced = True
+        except ValueError:
+            # If we cannot access the child record, do not
+            # append anything, just leave this one out.
+            pass
+
+    # If no child handle record could be retrieved, but there is children,
+    # return None to show that something went wrong.
+    if len(list_to_be_returned) == 0 and len(list_of_parts_handles) > 0:
+        list_to_be_returned = None
+        any_replaced = None
+
     return list_to_be_returned, any_replaced
 
 def _extract_info_on_one_part_record(handle):