Checks if a user client certificate (PKCS12) exists.

        Args:
            name (str): The name of the user keypair.

        Examples:
            Check if the client certificate "myuser" exists:

                exists = cdir.isClientCert('myuser')

        Returns:
            bool: True if the certificate is present, False otherwise.

def isClientCert(self, name):
        '''
        Checks if a user client certificate (PKCS12) exists.

        Args:
            name (str): The name of the user keypair.

        Examples:
            Check if the client certificate "myuser" exists:

                exists = cdir.isClientCert('myuser')

        Returns:
            bool: True if the certificate is present, False otherwise.
        '''
        crtpath = self._getPathJoin('users', '%s.p12' % name)
        return os.path.isfile(crtpath)