Empty string inserts (i.e. `''`) are inserted as `' '` (with space)

[guzman-raphael]

Test case:

queryStr = 'insert into `djtest_university`.`all` (`id`, `string`) values (4, "{S}")';
v = {''};
mym(self.connId, queryStr, v{:});

Result in MySQL:
select quote(string), length(string) from djtest_university.all where id=4;