def referer_not_found(self, extension):
if PyFunceble.CONFIGURATION["<STR_LIT>"]:<EOL><INDENT>to_write = {<EOL>self.current_time: {<EOL>"<STR_LIT>": PyFunceble.INTERN["<STR_LIT>"],<EOL>"<STR_LIT>": extension,<EOL>}<EOL>}<EOL>if self.output:<EOL><INDENT>output = self.output<EOL><DEDENT>else:<EOL><INDENT>output = PyFunceble.OUTPUT_DIRECTORY<EOL>output += PyFunceble.OUTPUTS["<STR_LIT>"]<EOL>output += PyFunceble.OUTPUTS["<STR_LIT>"]["<STR_LIT>"]["<STR_LIT>"]<EOL>output += PyFunceble.OUTPUTS["<STR_LIT>"]["<STR_LIT>"]["<STR_LIT>"]<EOL><DEDENT>current_content = self._get_content(output)<EOL>current_content.update(to_write)<EOL>self._write_content(current_content, output)<EOL>if PyFunceble.CONFIGURATION["<STR_LIT>"]:<EOL><INDENT>PyFunceble.requests.post(<EOL>PyFunceble.LINKS["<STR_LIT>"], data=to_write[self.current_time]<EOL>)<EOL><DEDENT><DEDENT>
Logs the case that the referer was not found.

:param extension: The extension of the domain we are testing.
:type extension: str