insert with select as value

I need to insert a value = max(value)+1, where max is a select limited
by a 'where' clause. Like this:

INSERT INTO table (idthread, idsection,txt)
VALUES (
   (SELECT max(idthread)+1 FROM table WHERE  idsection = 'CZE'),  'CZE',
'sample text')
);

This works fine, except when the result of SELECT is empty - which is
true when the table is empty.

Is it possible to create a "SELECT max(idthread)+1 FROM table WHERE
idsection = 'CZE';" that will return value 1 instead of value None if
the SELECT has no results?

--
Milos Prudek
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