Issue #3227004: Value 0 as password passed the validation

src/PasswordPolicyValidator.php

@@ -65,6 +65,10 @@ class PasswordPolicyValidator implements PasswordPolicyValidatorInterface {
       return TRUE;
     }
 
+    if ($password == "0") {
+      return FALSE;
+    }
+
     if (empty($edited_user_roles)) {
       $edited_user_roles = $user->getRoles();
       $edited_user_roles = array_combine($edited_user_roles, $edited_user_roles);