Check if child node is Q instance

Oring Exists() subqeries together "Exists() | Exists()" creates a Q instance, but not one which has Q node children.

Author: CelestialGuru

src/polymorphic/query_translate.py

@@ -70,7 +70,7 @@ def tree_node_correct_field_specs(my_model, node):
                 )
                 if new_expr:
                     node.children[i] = new_expr
-            else:
+            elif isinstance(child, models.Q):
                 # this Q object child is another Q object, recursively process this as well
                 tree_node_correct_field_specs(my_model, child)