Fix transform publisher

publisher/tools/exports/transform.py

@@ -9,6 +9,8 @@ def _get_controllers(root):
     groups = [c for c in groups if c.endswith("_GRP")]
     for group in groups:
         children = cmds.listRelatives(group, path=True, allDescendents=True, type="transform")
+        if not children:
+            continue
         children = [c for c in children if c.endswith("_CTL")]
         controllers[group] = children