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b83e2ae5a2
### What problem does this PR solve?
`retrieval_by_children()` in `rag/nlp/search.py` crashes with a
`TypeError: 'NoneType' object is not subscriptable` when a parent
("mom") chunk referenced by child chunks is missing from the index.
This happens when the index is in an inconsistent state — for example
after a partial re-index, a document deletion that didn't clean up all
children, or a race condition during ingestion. `dataStore.get()`
returns `None` for the missing parent, and the subsequent access to
`chunk["content_with_weight"]` raises a `TypeError`.
**Stack trace:**
```
TypeError: 'NoneType' object is not subscriptable
File "rag/nlp/search.py", line 792, in retrieval_by_children
"content_with_weight": chunk["content_with_weight"],
```
### Type of change
- [x] Bug Fix
### Fix
When `dataStore.get()` returns `None` for a parent chunk, fall back to
using the child chunks directly and continue processing the remaining
parents. This preserves retrieval results for all other chunks rather
than aborting the entire query with an exception.
```python
chunk = self.dataStore.get(id, idx_nms[0], [ck["kb_id"] for ck in cks])
if chunk is None:
chunks.extend(cks)
continue
```
---------
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>