Fix AttributeError causing Loan Notification script to fail (PP-997)

[jonathangreen]

Description

Make sure we are catching possible AttributeError exceptions and logging them, then continuing with other notifications.

Motivation and Context

It looks like the Loans Notification script is failing for some of our production CM instances with:

{
  "host": "3ca94f118883", 
  "name": "Holds Notification", 
  "level": "ERROR", 
  "filename": "monitor.py", 
  "message": "Error running Holds Notification monitor. Timestamp will not be updated.", 
  "timestamp": "2024-02-26T05:15:17.729003+00:00", 
  "traceback": "Traceback (most recent call last):
  File \"/var/www/circulation/core/monitor.py\", line 187, in run
    new_timestamp = self.run_once(progress)
  File \"/var/www/circulation/core/monitor.py\", line 481, in run_once
    new_offset, batch_size = self.process_batch(offset)
  File \"/var/www/circulation/core/monitor.py\", line 515, in process_batch
    self.process_items(items)
  File \"/var/www/circulation/core/jobs/holds_notification.py\", line 53, in process_items
    self.notifications.send_holds_notifications(items)
  File \"/var/www/circulation/core/util/notifications.py\", line 181, in send_holds_notifications
    f\"hold: {hold.work.title}. Patron has {len(tokens)} device tokens.\"
AttributeError: 'NoneType' object has no attribute 'title'"
}

This is causing us not write the already send notifications out to the DB, which means we try to send them again ... and again .. and again.

How Has This Been Tested?

Running unit tests.

Checklist

• I have updated the documentation accordingly.
• All new and existing tests passed.

[codecov]

Codecov Report

Attention: Patch coverage is 95.45455% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 90.08%. Comparing base (20d6e55) to head (2216306).
Report is 1 commits behind head on main.

Files	Patch %	Lines
core/util/notifications.py	95.45%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1698      +/-   ##
==========================================
- Coverage   90.08%   90.08%   -0.01%     
==========================================
  Files         245      245              
  Lines       28170    28176       +6     
  Branches     6422     6423       +1     
==========================================
+ Hits        25377    25382       +5     
- Misses       1848     1849       +1     
  Partials      945      945              

Flag	Coverage Δ
Api	75.78% <0.00%> (-0.02%)	⬇️
Core	59.81% <95.45%> (+<0.01%)	⬆️
migration	26.89% <0.00%> (-0.01%)	⬇️

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