### What problem does this PR solve?
Fix: can't upload image in ollama model #10447
### Type of change
- [X] Bug Fix (non-breaking change which fixes an issue)
### Change all `image=[]` to `image = None`
Changing `image=[]` to `images=None` avoids Python’s mutable default
parameter issue.
If you keep `images=[]`, all calls share the same list, so modifying it
(e.g., images.append()) will affect later calls.
Using images=None and creating a new list inside the function ensures
each call is independent.
This change does not affect current behavior — it simply makes the code
safer and more predictable.
把 `images=[]` 改成 `images=None` 是为了避免 Python 默认参数的可变对象问题。
如果保留 `images=[]`，所有调用都会共用同一个列表，一旦修改就会影响后续调用。
改成 None 并在函数内部重新创建列表，可以确保每次调用都是独立的。
这个修改不会影响现有运行结果，只是让代码更安全、更可控。
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