form.js plugin throws an error when text node is added in the dom

[vdua]

Description
form.js plugin is throwing an error

Uncaught TypeError: node.querySelector is not a function
    at form.js:79:83
    at Array.filter (<anonymous>)
    at form.js:79:36
    at Array.forEach (<anonymous>)
    at MutationObserver.<anonymous> (form.js:77:20)

To Reproduce
Steps to reproduce the behavior:

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

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
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Version:
run: $ hlx --version

Additional context
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