In a List type variable, options still show after choice type is selected and default value is set

For a List type variable (in the sys-dictionary), when the choice type "Dropdown without --None-- (must specify a default value)" is selected and a default value set, the form still shows the '-- None --' option in the list along with other choice values. Multiple choices should be selectable without the '-- None --' option in the choices list.

1. Navigate to System Dictionary > Dictionary.
2. Click New.
3. Create a record with the following values:
   
   • Table: incident
   • Type: List
   • Column label: List1
   • Column name: list1
   • Max length: 100
4. In the Choice List Specification tab or section, set Choice to Dropdown without --None-- (must specify an default value).
5. In the Default Value tab or section, set Default Value to 1.
6. Right-click in the header bar and select Save.
7. In the Choices related list, click New.
8. Create a record with the following values:
   
   • Label = L1
   • Value = 1
9. Click Submit.
10. Click New again.
11. Create a record with the following values: 
    
    • Label = L2
    • Value = 2
12. Click Submit.
13. Click Update.
14. Check the list variable in the incident form by navigating to Incident > Create New.
15. On the form, locate the new field named List1.
    Note that the List1 field shows the default value 1. 
16. Click the lock icon to open the field.
17. In the choices list, click the arrows to open the list.
    
    
    
    Note that the list contains -- None --, L1, and L2. The list should not show -- None -- because the Dropdown without --None-- (must specify a default value) choice type was selected in step 4.

After carefully considering the severity and frequency of this problem, and risk of attempting a fix, it has been decided to not address this issue in any current or future releases. We do not make these decisions lightly, and we apologise for any inconvenience.