Adds a ternary for blank emails for mail notifications

[Godmartinz]

Description

This adds a ternary operator on the checkedOutTo email check. removing the warning error of ErrorException: Attempt to read property "email" on null

Fixes # (issue)

Type of change

Please delete options that are not relevant.

• [ x] Bug fix (non-breaking change which fixes an issue)

[what-the-diff]

PR Summary

• Improved Handling of Null Cases in getNotifiables Method
  The method getNotifiables has been updated to better deal with instances where checkedOutTo may not have a value (null cases). This ensures the system can still function smoothly even if certain data isn't available.