def get_field(self, field_name, args, kwargs):
try:<EOL><INDENT>s = super(CustomFormatter, self)<EOL>return s.get_field(field_name, args, kwargs)<EOL><DEDENT>except KeyError:    <EOL><INDENT>return ("<STR_LIT:_>", field_name)<EOL><DEDENT>except IndexError:  <EOL><INDENT>return ("<STR_LIT:_>", field_name)<EOL><DEDENT>
Return an underscore if the attribute is absent.
Not all components have the same attributes.