fix pgsql

htdocs/install/mysql/migration/3.8.0-3.9.0.sql

@@ -77,7 +77,8 @@ ALTER TABLE llx_paiement ADD COLUMN ref varchar(30) NOT NULL DEFAULT '' AFTER ro
 
 ALTER TABLE llx_socpeople ADD COLUMN photo varchar(255) AFTER skype;
 
-ALTER TABLE llx_user_param MODIFY COLUMN param varchar(255) NOT NULL DEFAULT '';
+UPDATE llx_user_param SET param='ToDelete' WHERE param IS NULL;
+ALTER TABLE llx_user_param MODIFY COLUMN param varchar(255) NOT NULL;
 ALTER TABLE llx_user_param MODIFY COLUMN value text NOT NULL;
 
 ALTER TABLE llx_expedition ADD COLUMN import_key varchar(14);