:return: all knows applications

def get_applications():
        """
        :return: all knows applications
        """
        LOGGER.debug("ApplicationService.get_applications")
        args = {'http_operation': 'GET', 'operation_path': ''}
        response = ApplicationService.requester.call(args)
        ret = None
        if response.rc == 0:
            ret = []
            for application in response.response_content['applications']:
                ret.append(Application.json_2_application(application))
        elif response.rc != 404:
            err_msg = 'ApplicationService.get_applications - Problem while getting applications. ' \
                      'Reason: ' + str(response.response_content) + '-' + str(response.error_message) + \
                      " (" + str(response.rc) + ")"
            LOGGER.warning(err_msg)
        return ret