You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: group_email_credentials.rb
    path of file: ./repos/discourse/app/services/problem_check
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

##
# If group SMTP or IMAP has been configured, we want to make sure the
# credentials are always valid ot
    
  def try_validate(group, &blk)
    begin
      blk.call
      nil
    rescue *EmailSettingsExceptionHandler::EXPECTED_EXCEPTIONS => err
      message =
        I18n.t(
          "dashboard.group_email_credentials_warning",
          {
            base_path: Discourse.base_path,
            group_name: group.name,
            group_full_name: group.full_name,
            error: EmailSettingsExceptionHandler.friendly_exception_message(err, group.smtp_server),
          },
        )

      Problem.new(message, priority: "high", identifier: "group_#{group.id}_email_credentials")
    rescue => err
      Discourse.warn_exception(
        err,
        message:
          "Unexpected error when checking SMTP credentials for group #{group.id} (#{group.name}).",
      )
      nil
    end