fix(server): do not forward empty-string entity ids as filters (#5992)

Co-authored-by: Kartik <kartik.labhshetwar@mem0.ai>

server/main.py

@@ -426,7 +426,7 @@ def get_all_memories(
             # Admin all-memory listing is intentionally raw; scoped get_all below applies expiry visibility.
             return _list_all_memories(limit=top_k if top_k is not None else ALL_MEMORIES_LIMIT)
         filters = {
-            k: v for k, v in {"user_id": user_id, "run_id": run_id, "agent_id": agent_id}.items() if v is not None
+            k: v for k, v in {"user_id": user_id, "run_id": run_id, "agent_id": agent_id}.items() if v
         }
         params = {"filters": filters}
         if top_k is not None:
@@ -456,7 +456,7 @@ def search_memories(search_req: SearchRequest, _auth=Depends(verify_auth)):
         deprecated_keys = []
         for entity_key in ("user_id", "agent_id", "run_id"):
             entity_val = getattr(search_req, entity_key, None)
-            if entity_val is not None:
+            if entity_val:
                 filters[entity_key] = entity_val
                 deprecated_keys.append(entity_key)
         if deprecated_keys:
@@ -535,7 +535,7 @@ def delete_all_memories(
         raise HTTPException(status_code=400, detail="At least one identifier is required.")
     try:
         params = {
-            k: v for k, v in {"user_id": user_id, "run_id": run_id, "agent_id": agent_id}.items() if v is not None
+            k: v for k, v in {"user_id": user_id, "run_id": run_id, "agent_id": agent_id}.items() if v
         }
         get_memory_instance().delete_all(**params)
         return MessageResponse(message="All relevant memories deleted")