"Feed source does not exist" should not be shown after deleting feed source.

[binh-dam-ibigroup]

Observed behavior (please include a screenshot if possible)

After deleting a feed source, an error message stating that it does not exist is shown.

Expected behavior

No error message should be shown.

Steps to reproduce the problem

1. Create a feed source
2. Delete a feed source
3. Observe error message is shown.

Any special notes on configuration used

NA

Version of datatools-ui and datatools-server if applicable (exact commit hash or branch name)

Recent versions of datatools-ui.