Fixed Issue #1152: Added error messaging and haptic feedback to empty UITextField

[KrisRJack]

Fixes #1152

*** This is a build on PR #1234 ***

Added error messaging and haptic feedback when a user attempts to edit and save an empty textfield.

Testing and Review Notes

Open app. Click a login cell. In editing mode, remove all values in the username and/or password. Click save.

Screenshots

To Do

• add “WIP” to the PR title if pushing up but not complete nor ready for review
• double check the original issue to confirm it is fully satisfied
• add testing notes and screenshots in PR description to help guide reviewers
• add unit tests
  • optional: consider adding integration tests (UI specs)
• consider running this branch in the simulator and check for warnings
• request the "UX" team perform a design review (if/when applicable)
• make sure CI builds are passing (e.g.: fix lint and other errors)

[KrisRJack]

To see this issue resolved, please refer to #1234