Invalid browser context improvements

[Danp2]

Pull request

Proposed changes

• Add new error code to indicate an invalid browser context
• Improve _WD_CheckContext and _WD_CheckContext error detection / handling to include invalid browser context

Checklist

Put an x in the boxes that apply. If you're unsure about any of them, don't hesitate to ask. We are here to help!
This is simply a reminder of what we are going to look for before merging your code.

• [x] I have read and noticed the CODE OF CONDUCT document
• [x] I have read and noticed the CONTRIBUTING document
• [ ] I have added necessary documentation or screenshots (if appropriate)

Types of changes

Please check x the type of change your PR introduces:

• [ ] Bugfix (change which fixes an issue)
• [x] Feature (change which adds functionality)
• [ ] Code style update (formatting, renaming)
• [ ] Refactoring (functional, structural)
• [ ] Documentation content changes
• [ ] Other (please describe)

What is the current behavior?

No detection of invalid browser context

What is the new behavior?

Functions are enhanced to detect / handle when an error related to invalid browser context occurs

Additional context

System under test

Please complete the following information.

• OS: [e.g. Windows 10]
• OS Arch.: [e.g. X64]
• Browser [e.g. firefox]
• Browser version [e.g. 96.0.3]

[mlipok]

I test it and it works fine - I mean it catches this error properly. You have green light from me.