New Database name field doesn't have dynamic validation

[Charles-Gagnon]

When an invalid name is entered into the database field there's no indication that anything is wrong until the user clicks OK. For any validation that we do client-side (such as checking for an empty name) we should :

1. Disable the OK button until all fields have correct values
2. Have validation on the field itself for checking that the value is valid - so users get feedback as they type

Note: This applies to all Object Management dialogs. The dialog-level error message should only be used for displaying an error that occurs when doing an action on the dialog itself (such as OK or Script)