Require score to be specified for static validators

Author: niemela

spec/2023-07-draft.md

@@ -1009,7 +1009,10 @@ If a map is specified, its allowed key are:
 
 The `static_validation` key can also have the value of `false` meaning there is no static validation, or `true` meaning that static validation is enabled with no additional arguments and unspecified maximum score (to be determined by [maximum score inference](#maximum-score-inference)).
 
-It is an error to provide a static validator for `submit-answer` type problems, or to specify a `score` in a test group with `pass-fail` aggregation.
+It is an error to:
+- provide a static validator for `submit-answer` type problems,
+- specify a `score` in a test group with `pass-fail` aggregation or a problem that does not have the type `scoring`,
+- *not* specify a `score` in a test group that has `sum` or `min` aggregation.
 
 ### Invocation