rules: fix bug validating rules

capa/rules.py

@@ -155,6 +155,7 @@ def ensure_feature_valid_for_scope(scope: str, feature: Feature):
     ):
         raise InvalidRule("feature %s not support for scope %s" % (feature, scope))
 
+    if not isinstance(feature, capa.features.common.Characteristic):
         # features of this scope that are not Characteristics will be Type instances.
         # check that the given feature is one of these types.
         types_for_scope = filter(lambda t: isinstance(t, type), SUPPORTED_FEATURES[scope])