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

.hgtags

@@ -24,3 +24,4 @@
 a726c268a679b32274252302b5a69ddcd0ee18ac 16.0.1.1.2
 a09163507bf89c0dedd5d1d1498d1c76924f06f6 16.0.1.2.0
 381f06c9d5fdcfbf147e84d0ecbec098a46863b0 16.0.1.2.1
+529370efc56bfd6253005dbfb37c5075c5533ab4 16.0.1.2.2