Merge pull request #1030 from eldar702/fix/none-metadata-residual-guards

fix: guard None metadata/doc in tool_check_duplicate and Layer1/Layer2

mempalace/layers.py

@@ -124,6 +124,8 @@ class Layer1:
         # Score each drawer: prefer high importance, recent filing
         scored = []
         for doc, meta in zip(docs, metas):
+            meta = meta or {}
+            doc = doc or ""
             importance = 3
             # Try multiple metadata keys that might carry weight info
             for key in ("importance", "emotional_weight", "weight"):
@@ -222,6 +224,8 @@ class Layer2:
 
         lines = [f"## L2 — ON-DEMAND ({len(docs)} drawers)"]
         for doc, meta in zip(docs[:n_results], metas[:n_results]):
+            meta = meta or {}
+            doc = doc or ""
             room_name = meta.get("room", "?")
             source = Path(meta.get("source_file", "")).name if meta.get("source_file") else ""
             snippet = doc.strip().replace("\n", " ")

mempalace/mcp_server.py

@@ -742,8 +742,10 @@ def tool_check_duplicate(content: str, threshold: float = 0.9):
                 dist = results["distances"][0][i]
                 similarity = round(1 - dist, 3)
                 if similarity >= threshold:
-                    meta = results["metadatas"][0][i]
-                    doc = results["documents"][0][i]
+                    # Chroma 1.5.x can return None for partially-flushed rows;
+                    # coerce to empty sentinels so downstream .get() is safe.
+                    meta = results["metadatas"][0][i] or {}
+                    doc = results["documents"][0][i] or ""
                     duplicates.append(
                         {
                             "id": drawer_id,