Failing test for new expected behaviour
Show error message if recipient is invalid
Obtain valid recipient emails directly instead of using the sorted list
Added response recipients checks to FeedbackQuestionSubmissionEditSaveAction
Add test to StudentFeedbackSubmissionEditSaveActionTest
Added empty string as a valid recipient
Changed gmail.com to gmail.tmt
Merge branch 'master' into Issue2350
Added more tests for invalid recipients
Merge branch 'master' into Issue2350
Removed trailing whitespace
Checks that invalid responses are not saved
Modified error msg regarding updating recipient in a response
Merge branch 'master' into Issue2350
Update tests to test for correct error msg
[Issue2350] feedbackSubmissionEditSave: check recipients for feedback response are valid