[Filters][Fixed] '_none' sometimes ignored

CHANGELOG.md

@@ -8,6 +8,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed
 - Netlist generation problems with components on the PCB but not in schematic.
   (#578)
+- Filters: _none filter not always honored (i.e. exclude in BoM) (#580)
 
 ## [1.6.4] - 2024-02-02
 ### Added

kibot/fil_base.py

@@ -342,7 +342,7 @@ class BaseFilter(RegFilter):
         elif isinstance(names, str):
             # User provided, but only one, make a list
             if names == '_none':
-                return None
+                return [DummyFilter()]
             names = [names]
         # Here we should have a list of strings
         filters = []