`Press Keys` keywords doesn't work when selector = None

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Describe the bug Press Keys keyword thrown error with "Selector not valid: None" when set the selector as "None" It seems conflict with the example provided on documentation: https://qahive.github.io/robotframework-puppeteer/PuppeteerLibrary.html#Press%20Keys

To Reproduce Steps to reproduce the behavior:

1. Just type something like Press Keys None A

Expected behavior By right as per documentation it should work

Screenshots

Desktop (please complete the following information):

• OS: Windows 11
• Browser Playright Chromium

Smartphone (please complete the following information): Not Applicable

Additional context Add any other context about the problem here.