def has_credential(self):
if self._credential is None:<EOL><INDENT>return False<EOL><DEDENT>else:<EOL><INDENT>return True<EOL><DEDENT>
Tests if this authentication has a credential for export.

        :return: ``true`` if this authentication has a credential, ``false`` otherwise
        :rtype: ``boolean``


        *compliance: mandatory -- This method must be implemented.*