fix: iframe type error with body[contenteditable]

[kuceb]

• fix Cannot read property 'body' of null error when using .type() in a contenteditable body element inside an iframe #5930

User facing changelog

We fixed a regression in 3.5.0 where typing into an iframe with a body element with the contenteditable attribute would throw an error.

Additional details

How has the user experience changed?

PR Tasks

• Have tests been added/updated?
• Has the original issue been tagged with a release in ZenHub?

[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

6956 • 0 • 97 • 0

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Run details

Project	cypress
Status	Passed
Commit	8af0fea
Started	Feb 27, 2020 7:21 AM
Ended	Feb 27, 2020 7:27 AM
Duration	05:59 💡
OS	Linux Debian - 9.11
Browser	Multiple

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[jennifer-shehane]

Manually verified this fixes the original issue.