Throw a dedicated exception for fully empty actor descriptions in

NodaValidationHelper

src/NodaValidationHelper.php

@@ -27,6 +27,13 @@ final class NodaValidationHelper {
      */
     public static function validateActorDescription(string $description, array $names = []):void {
 
+        // For nodac, empty actor descriptions are to be allowed. Thus, a
+        // dedicated check for fully empty ones with a dedicated exception
+        // is needed.
+        if (empty($description)) {
+            throw new MDInvalidEmptyInputException("No author name is provided");
+        }
+
         // Throw error on descriptions that are too short
         if (\mb_strlen($description) < 10) {
             throw new MDgenericInvalidInputsException("Author description is too short");