When dependent picklists added to the layout SF validation rules work incorrectly

[githubbob42]

Mingle Card: 4754
Steps to Reproduce

| | |
|-|-|
|**Version #**|4.0.1.3550|
|**Hardware**| |
|**OS**|windows|
|**Browser**| |
|**Username**|[email protected]|
|**Password**|computer46|
|ORG ID| |
|User ID| |
|RayGun Error ID| |
  
 

1. login to hunterpeak.herokuapp.com and search for T-B7B-7E8-6EF7 ticket, and go to ticket Details screen.
   This ticket was created in backoffice and has missing value in required field “Custom Text Field”.
2. click any icon on the sidebar (“Logs” for example)

Expected Result

since there were no change made to the ticket , user should be allowed to go to another screen

Actual Result

_validation msg dialog box pops up stating 
”_Leaving this screen will result in losing your changes because of Validation errors”

Analysis

There is a bug in `salesforce-picklist.js` that causes the picker to try to clear dependent picklists when the controlling field is empty. The bug is that it sets the field to an empty string, even if the field is already blank (the field starts out with a null value).

Related Cards

Test Plan

selenium > srongervalidations.js > Test 7. Stronger validation on details pages test (Ticket page level required field)

Be sure to manually test clearing the value of a dependent picklist.

This has passed the 3 related selenium tests

[githubbob42]

Pull Request #2206