Client should use .get, not getattr, on dictionary; was leading to loss of...

Client should use .get, not getattr, on dictionary; was leading to loss of channel param in API call

model_server/clients/ilastik_map_objects.py

@@ -18,7 +18,7 @@ def main(request_func, in_abspath, params):
 	
 	px_ilp = params['pixel_classifier_path']
 	ob_ilp = params['object_classifier_path']
-	channel = getattr(params, 'channel', None)
+	channel = params.get('channel', None)
 	mip = params.get('mip', False)
 	
 	# configure input and output paths