Add a call to action to the new AST error

[jennifer-shehane]

User Changelog

N/A - this is pre-release fix

Additional Details

Error messages should detail next steps for the user. What should they do if they’re seeing the error? It’s my understanding that users should not see this error at all - so the proper call to action would be to open an issue in our repo.

[cypress-bot]

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User Experience

• The feature/bugfix is self-documenting from within the product.
• The change provides the end user with a way to fix their problem (no dead ends).

Functionality

• The code works and performs its intended function with the correct logic.
• Performance has been factored in (for example, the code cleans up after itself to not cause memory leaks).
• The code guards against edge cases and invalid input and has tests to cover it.

Maintainability

• The code is readable (too many nested 'if's are a bad sign).
• Names used for variables, methods, etc, clearly describe their function.
• The code is easy to understood and there are relevant comments explaining.
• New algorithms are documented in the code with link(s) to external docs (flowcharts, w3c, chrome, firefox).
• There are comments containing link(s) to the addressed issue (in tests and code).

Quality

• The change does not reimplement code.
• There's not a module from the ecosystem that should be used instead.
• There is no redundant or duplicate code.
• There are no irrelevant comments left in the code.
• Tests are testing the code’s intended functionality in the best way possible.

Internal

• The original issue has been tagged with a release in ZenHub.

[cypress]

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Test summary

3426 • 0 • 49 • 0

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Run details

Project	cypress
Status	Passed
Commit	a574a92
Started	May 12, 2020 4:29 AM
Ended	May 12, 2020 4:35 AM
Duration	06:18 💡
OS	Linux Debian - 10.1
Browser	Firefox 74

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[flotwig]

very good