Fix errors in xml_parser and rerun

wrap/gtwrap/xml_parser/xml_parser.py

@@ -56,9 +56,14 @@ class XMLDocParser:
         documenting_index = self.determine_documenting_index(
             cpp_class, cpp_method, method_args_names, member_defs)
 
+        if member_defs:
+            self.print_if_verbose(
+                f"Extracted {len(member_defs)} member definitions for {cpp_class}.{cpp_method}."
+            )
+
         # Extract the docs for the function that matches cpp_class.cpp_method(*method_args_names).
         return self.get_formatted_docstring(member_defs[documenting_index],
-                                            ignored_params)
+                                            ignored_params) if member_defs else ""
 
     def get_member_defs(self, xml_folder: str, cpp_class: str,
                         cpp_method: str):
@@ -95,7 +100,7 @@ class XMLDocParser:
             return ""
 
         # Create the path to the file with the documentation for cpp_class.
-        xml_class_file = xml_folder_path / class_index.attrib['refid'] + '.xml'
+        xml_class_file = xml_folder_path / f"{class_index.attrib['refid']}.xml"
 
         # Parse the class file
         class_tree = self.parse_xml(xml_class_file)