Dropdown lists lose data upon saving in Users and Organizations if they are the only ones modified

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 6.2.0 CE M3, 6.2.0 CE M4, 6.2.0 CE M6
• Fix Version/s: 6.2.0 CE RC2
• Component/s: Legacy, Legacy > Control Panel menu
• Labels:
  • QA-R
  • QA-TP
• Story Points: 4
• Fix Priority: 2

Reproduction steps:
1. Go to Control Panel -> Users and Organizations -> Add -> Regular Organization
2. Fill the Name, then Save.
3. Click on Addresses and fill only the Country (US), the Region (Alabama, or any other) fields. Don't fill out the required Street 1 and City fields!
4. After you Save, you get an error message "Street 1 and city are required fields. Postal code could be required in some countries.", and the Country and the Region fields are emptied, so I must reenter these data.