train_dreambooth_sd3.py still broken

### Describe the bug

incorrect code/logic, referencing variables issue

### Reproduction

run train_dreambooth_sd3.py with valid args

### Logs

text_input_ids_list referenced before variable assignment

### System Info

diffusers 30 dev (source)

### Who can help?

_No response_

Start with train_dreambooth_sd3.py and reproduce the issue by running it with valid arguments. Trace where text_input_ids_list is referenced before assignment and confirm the script completes without that error; no specific test file is mentioned in the issue.

索引モデルが issue の本文から書いたものです。