fix: if nodes has string, close #68

[Scrum]

Proposed Changes

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Types of Changes

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• [x] Bug (non-breaking change which fixes an issue)
• [ ] Feature (non-breaking change which adds functionality)
• [ ] Breaking Change (fix or feature which changes existing functionality)

Checklist

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• [x] I have read the CONTRIBUTING guide
• [x] Lint and unit tests pass with my changes
• [ ] I have added tests that prove my fix is effective/works
• [ ] I have added necessary documentation (if appropriate)
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Further Comments

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Reviewers: @mrmlnc, @jescalan, @michael-ciniawsky, @posthtml/collaborators

[coveralls]

Coverage remained the same at 97.423% when pulling c1ec0f41fb6804648504a38a66e4b778e6c5388e on milestone-1.3.1 into 8fd2616778eb599e2c6c7caf2836cfaf75448ac5 on master.