Do not expect `category_map` to know all categories in `GROUPS.values()`

ahisto_named_entity_search/recognition/evaluator.py

@@ -53,7 +53,12 @@ class AggregateMeanFScoreEvaluator(TokenClassificationEvaluator):
 
     def get_f_score(self, group: Group, expected_labels: List[Category],
                     actual_labels: List[Category]) -> FScore:
-        expected_categories: Set[Category] = {self.category_map[category] for category in group}
+        expected_categories: Set[Category] = {
+            self.category_map[category]
+            for category
+            in group
+            if category in self.category_map
+        }
 
         true_positives, false_positives, false_negatives = 0, 0, 0
         for expected_label, actual_label in zip_equal(expected_labels, actual_labels):