Failed to call the on_read_trigger method: `get_dataset_title`

[yuanzhou]

Noticed this bug on DEV

[2025-09-30 18:23:27] INFO in schema_triggers: Executing 'get_dataset_title()' trigger method on uuid: 4c66a26432cc1a510914ea0fc085bf77
[2025-09-30 18:23:27] INFO in schema_neo4j_queries: ======get_dataset_donor_organs_info() ds_donors_organs_query======
[2025-09-30 18:23:27] ERROR in schema_manager: Failed to call the on_read_trigger method: get_dataset_title
Traceback (most recent call last):
  File "/usr/src/app/src/./schema/schema_manager.py", line 512, in generate_triggered_data
    target_key, target_value = trigger_method_to_call(key, normalized_class, request, user_token, existing_data_dict, new_data_dict)
  File "/usr/src/app/src/./schema/schema_triggers.py", line 1159, in get_dataset_title
    for donor_organ_data in donor_organs_list:
TypeError: 'NoneType' object is not iterable

[yuanzhou]

Addressed via #929

[yuanzhou]

Now https://entity-api.dev.hubmapconsortium.org/entities/16d9ffb49ad54fed796c47a985360de1 returns

"title": "PhenoCycler data from 0 organs of 0 different donors"