fixed tinyint column processing for case when length is empty

Test with MySQL 8.x

Preparations

Run following SQL to create test table (replace "inp_" prefix with current system table prefix).

CREATE TABLE `inp_TestTinyInt` (
  `ColumnNone` tinyint DEFAULT NULL,
  `Column3` tinyint(3) DEFAULT NULL
);

Testing

1. use the “Show Structure” button in the Tools → System Tools section on TestTinyInt table
2. confirm that both columns have “kOptionsFormatter” assigned to them in the unit config field declaration