If no required label is defined in the bot config, skip label checking

[nerdalert]

Skip the method checkBotEnableStatus if there are no required. Something like:

    var labelPresent bool
    // Set labelPresent to true if RequiredLabels is empty
    if len(h.RequiredLabels) == 0 {
        labelPresent = true
    } else {
        labelPresent, err = h.checkRequiredLabel(ctx, client, prComment, h.RequiredLabels)
    }
    if !labelPresent {
        detailsMsg := fmt.Sprintf("Beep, boop 🤖: To proceed, the pull request must have one of the '%v' labels.", h.RequiredLabels)
        if err != nil {
            detailsMsg = fmt.Sprintf("%s\nError: %v", detailsMsg, err)
        }

Prevents a scenario like this:

Beep, boop 🤖: To proceed, the pull request must have one of the '[]' labels.

[nerdalert]

Correction, this might just be a confusing log message. Going to change it to, not enabled as opposed to missing label.

    if !isBotEnabled {
        detailsMsg := fmt.Sprintf("Beep, boop 🤖: To proceed, the pull request must have one of the '%v' labels.", h.RequiredLabels)
        if err != nil {
            detailsMsg = fmt.Sprintf("%s\nError: %v", detailsMsg, err)
        }