fix: dropper AttributeError when redirect stub has no title

[TechGenius-Karan]

Closes #13169

fix

Technical

add_storage_items_for_redirects in bookshelves.py inserts a bare web.storage({"key": key}) stub for any reading log work that is missing from Solr and has no edition key. That stub then flows into dropper.html where line 29 does work.title — but web.storage.__getattr__ raises AttributeError for any missing key, producing the reported template error.

Two-part fix:

1. bookshelves.py (line 282) — include "title": "" in the stub, consistent with how add_storage_items_for_deletes always includes a title in its stubs.
2. dropper.html (line 29) — switch from work.title to work.get('title', '') for defense in depth; this is already how edition is handled on the same line.

Testing

Reproduce: have a reading log entry whose work has been redirected to another OL key and was added without a specific edition. Open /people/<username>/books/want-to-read.

• Before: AttributeError: 'title' in template, falls back to default template
• After: page renders normally; the redirected entry shows with no title (empty string)

Screenshot

Backend-only fix, no UI change.

Stakeholders

@cdrini @mekarpeles