Maya - Look: Skip invalid connections

pype/plugins/maya/publish/collect_look.py

@@ -277,7 +277,13 @@ def collect(self, instance):
  if looksets:
  for look in looksets:
  for at in shaderAttrs:
- con = cmds.listConnections("{}.{}".format(look, at))
+ try:
+ con = cmds.listConnections("{}.{}".format(look, at))
+ except ValueError:
+ # skip attributes that are invalid in current
+ # context. For example in the case where
+ # Arnold is not enabled.
+ continue
  if con:
  materials.extend(con)