Update to handle empty filter dict

chromadb/api/types.py

@@ -594,8 +594,8 @@ def validate_where(where: Where) -> None:
     """
     if not isinstance(where, dict):
         raise ValueError(f"Expected where to be a dict, got {where}")
-    if len(where) != 1:
-        raise ValueError(f"Expected where to have exactly one operator, got {where}")
+    if len(where) > 1:
+        raise ValueError(f"Expected where to have at most one operator, got {where}")
     for key, value in where.items():
         if not isinstance(key, str):
             raise ValueError(f"Expected where key to be a str, got {key}")

chromadb/segment/impl/metadata/grpc_segment.py

@@ -142,9 +142,9 @@ def _where_to_proto(self, where: Optional[Where]) -> pb.Where:
         response = pb.Where()
         if where is None:
             return response
-        if len(where) != 1:
+        if len(where) > 1:
             raise ValueError(
-                f"Expected where to have exactly one operator, got {where}"
+                f"Expected where to have at most one operator, got {where}"
             )
 
         for key, value in where.items():