require with inverse

tiramisu/setting.py

@@ -651,6 +651,8 @@ class Settings(object):
                                              " '{0}' with requirement on: "
                                              "'{1}'").format(path, reqpath))
                 if option.impl_is_multi():
+                    if index is None:
+                        continue
                     idx = index
                 else:
                     idx = None
@@ -683,8 +685,7 @@ class Settings(object):
                         raise value
                 else:
                     orig_value = value
-                if (not inverse and
-                        value in expected or
+                if (not inverse and value in expected or
                         inverse and value not in expected):
                     if debug:
                         if isinstance(orig_value, PropertiesOptionError):