After deleting mail in the mail manager,preview is not showing properly

Steps to reproduce

• Login 
• navigate to the mail manager
• delete any of the mail in the list
• it will be deleted successfully 
• now click on 1st mail in the list to preview
  • preview is not available -showing as untitled -ref
• now click on the 4th mail to preview 
  • 2nd mail is opening for a preview -ref

Fixed with 4d152ad6

closed

changed milestone to %8.2.0