receiver: handle gmask 0 and group 0 in reprogrammable keys

lib/logitech_receiver/settings_templates.py

@@ -362,12 +362,13 @@ def _feature_reprogrammable_keys_choices(device):
 	for k in keys:
 		if k[2] & _special_keys.KEY_FLAG.reprogrammable:
 			key_choices = [ k[1] ] # it should always be possible to map the key to itself
-			for g in range(1,9):
-				if k[3] & 2**(g-1):
+			for g in range(0,9):
+				if ( k[3]==0 if g==0 else k[3] & 2**(g-1) ):
 					for gm in groups[g]:
 						if int(gm) != int(k[0]): # don't put itself in twice
 							key_choices.append(gm)
-			choices[k[0]] = key_choices
+			if len(key_choices) > 1:
+				choices[k[0]] = key_choices
 	return choices
 
 def _feature_reprogrammable_keys():