need to take care location in bot creation

[hibrenda]

Complete the necessary portions of this template and delete the rest.

Describe the bug

User could specify the bot location during the bot creation and next time the location will be loaded from recent usage. Default folder location defined in #1363.

If user create the bot by specifying the location, and then delete such folder, user will see error shows as following. and click next, bot will be created into default folder "MyBot".

So we need to check if recent usage is still valid , if folder has been moved, we should load default folder. If something wrong with default folder, at least we should let user to update the bot create location.

Steps

• create a new bot with valid folder
• delete folder
• go to homepage and create a new bot again
• hit error

Version

master

Browser

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• Chrome
• Safari
• Firefox
• Edge

OS

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• macOS
• Windows
• Ubuntu

To Reproduce

Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior

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Additional context

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[cwhitten]

addressed in #1548