Collect unmapped entries in dry-run mode

See museum-digital/importer#235

src/MDConcActor.php

@@ -1278,7 +1278,8 @@ final class MDConcActor implements MDImporterConcordanceListInterface {
     public static function getConcordanceTarget(string $input):int {
 
         if (!isset(self::ACTOR_ROLES_TO_EVENT_TYPE[$input])) {
-            throw MDImporterMissingConcordance::setup("actor role", $input);
+            MDImporterMissingConcordance::throw("actor role", $input);
+            return 1; // Return default in dry-run mode
         }
 
         return self::ACTOR_ROLES_TO_EVENT_TYPE[$input];