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[Portal] Throw error if the children is undefined or null #18675

Description

@luffywuliao
  • The issue is present in the latest release.
  • I have searched the issues of this repository and believe that this is not a duplicate.

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Material-UI v4.?.?
React
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TypeScript
etc.

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good first issueGreat for first contributions. Enable to learn the contribution process.scope: portalChanges related to the portal.type: bugIt doesn't behave as expected.

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