Bug 38522: (follow-up) Edit db_rev and preserve comment

Signed-off-by: Katrin Fischer <[email protected]>

installer/data/mysql/db_revs/241200001.pl

@@ -8,7 +8,7 @@
         my ($args) = @_;
         my ( $dbh, $out ) = @$args{qw(dbh out)};
 
-        $dbh->do(q{ALTER TABLE erm_agreements MODIFY COLUMN license_info mediumtext});
+        $dbh->do(q{ALTER TABLE erm_agreements MODIFY COLUMN license_info mediumtext DEFAULT NULL COMMENT 'info about the license'});
         say_success( $out, "Updated erm_agreements.license_info to mediumtext." );
     },
 };