Function registers Log facade using configuration in app.config.<env>.

        Note:
          The Log facade will be registered using default configuration
          if there isn't any 'log' key in app.config.<env>.

def register_log(self):
        """
        Function registers Log facade using configuration in app.config.<env>.

        Note:
          The Log facade will be registered using default configuration
          if there isn't any 'log' key in app.config.<env>.
        """
        if not empty('log', self.config):

            if not empty('glim', self.config['log']):
                GlimLog.boot(name='glim', config=self.config['log']['glim'])
            else:
                GlimLog.boot(name='glim')

            if not empty('app', self.config['log']):
                Log.boot(name='app', config=self.config['log']['app'])
            else:
                Log.boot(name='app')
        else:
            Log.boot(name='app')
            GlimLog.boot(name='glim')