Return original expression for non-matching regex in find_field_with_sort_order

• Updated the find_field_with_sort_order function to return (expression, None) when the regex doesn't match.
• This provides clearer feedback by preserving the original expression.

--HG-- branch : 16.0

utils/sorting.py

@@ -29,7 +29,7 @@ def find_field_with_sort_order(expression):
     Returns field name and value if found, else `(None, None)`.
     """
     match = re.match(r'(\w+)\.sorted\("([^"]+)"\)', expression)
-    return match.groups() if match else (None, None)
+    return match.groups() if match else (expression, None)
 
 
 def parse_fields_with_sort_directions(input_string):