Safely handle misconfigured extensions

[veler]

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• New feature or enhancement
• UI change (please include screenshot!)
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What is the current behavior?

Issue Number: #1160

What is the new behavior?

We now safely handle extensions that aren't well configured, preventing a total crash of DevToys, logging failures, and when possible, displaying explicitly what's wrong.

Other information

Quality check

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