Empty decimal field is not treated in database driver

[filipbartmann]

Steps to reproduce the issue

Add decimal field to table and save content in own component with empty field.

Expected result

Content would be successfully saved

Actual result

Appears error "Incorrect decimal value"

System information (as much as possible)

I try it on Joomla 5.3, 5.4 and 6.0.

Additional comments

It's caused by missing next contidion in function insertObject in Mysql and Mysqli database drivers:

if (stristr($tableColumns[$k], 'decimal') !== false && $v === '') {
                continue;
}

If I add this under condition:

if (stristr($tableColumns[$k], 'int') !== false && $v === '') {
               continue;
}

then saving content on my component works as expected