Remove deprecated code from 'MessageHandler'

beat/core/message_handler.py

@@ -59,7 +59,6 @@ class ProxyMessageHandler(MessageHandler):
         # implementations
         self.callbacks.update(dict(
           wrt = self.write,
-          idm = self.is_data_missing,
           oic = self.output_is_connected,
         ))
 
@@ -101,17 +100,6 @@ class ProxyMessageHandler(MessageHandler):
         self.socket.send('ack')
 
 
-    def is_data_missing(self, name):
-        """Syntax: idm output"""
-
-        logger.debug('recv: idm %s', name)
-
-        output_candidate = self._get_output_candidate(name)
-        what = 'tru' if output_candidate.isDataMissing() else 'fal'
-        logger.debug('send: %s', what)
-        self.socket.send(what)
-
-
     def output_is_connected(self, name):
         """Syntax: oic output"""