Merge pull request #3703 from GhostofGeeeee/Subservices

[ChannelSelection] Fix new crash

Author: jbleyel

lib/python/Screens/ChannelSelection.py

@@ -2667,7 +2667,7 @@ def newServicePlayed(self):
 		return ret
 
 	def addToHistory(self, ref):
-		if self.history and self.isSubservices(self.history[self.history_pos][0]) and self.isSubservices(self.servicePath[0]):  # Only replace subservice
+		if self.history and self.servicePath and self.isSubservices(self.history[self.history_pos][0]) and self.isSubservices(self.servicePath[0]):  # Only replace subservice
 			self.history[self.history_pos] = self.servicePath[:] + [ref]
 			return
 		if self.delhistpoint is not None: