Remove empty responses for smarthub inputs

Empty "reponse" members were causing random input values to be selected
when input query received no response.  Get rid of them and update
matching logic to handle missing response values.

This partially fixes #11 -- now the behavior is at least consistent.

Samsung Ex-Link.indigoPlugin/Contents/Server Plugin/plugin.py

@@ -291,10 +291,10 @@ def actionControlUniversal(self, action, dev):
 				 "response" : [0x04, 0x00, 0x00, 0xf1, 0x59, 0x00, 0x00, 0xb6]
 			},
 		"NETFLIX" : { "command" : [0x08, 0x22, 0x0d, 0x00, 0x00, 0xF3, 0xD6]
-					  "response" : [] #netflix sends the generic smarthub response
+					  #netflix sends the generic smarthub response
 			},
-		"AMAZON" : { "command" : [0x08, 0x22, 0x0d, 0x00, 0x00, 0xF4, 0xD5],
-					 "response" :  [] #amazon sends the generic smarthub response
+		"AMAZON" : { "command" : [0x08, 0x22, 0x0d, 0x00, 0x00, 0xF4, 0xD5]
+					 #amazon sends the generic smarthub response
 			}
 		#I'm not sure why Netflix and Amazon are so special, but my TV doesn't have
 		#direct access to any other smarthub apps.  Perhaps newer TVs do.
@@ -866,7 +866,7 @@ def isPowerOn(self, dev):
 	def updateInput(self, dev):
 		reply = self.sendQuery(dev, "INPUT")
 		for input in self.inputs:
-			if bytearray(reply[-8:]) == bytearray(self.inputs[input]["response"]):
+			if self.inputs[input].get("response") is not None and bytearray(reply[-8:]) == bytearray(self.inputs[input]["response"]):
 				self.logger.info(dev.name+": Active input is "+input)
 				dev.updateStateOnServer("input", input)
 				return