fix: protect undefined values on SelectComponents

[christiancp100]

What does it do?

It adds protection for possibly undefined values in SelectComponents since the default value given in packages/core/content-type-builder/admin/src/components/TabForm/index.js:

/**
    * Use undefined as the default value because not every input wants a string e.g. Date pickers
*/
const value = get(modifiedData, input.name, undefined);

Why is it needed?

Right now the CTB throws an error when creating a component inside a Dynamic Zone.

How to test it?

Try to create a component inside a dynamic zone in the CTB.

Related issue(s)/PR(s)

Closes #18633
Closes #18665

[github-actions]

Size Change: 0 B

Total Size: 645 kB

ℹ️ View Unchanged

Filename	Size
examples/getstarted/build/bb4d0d527bdfb161bc5a.svg	2.33 kB
examples/getstarted/build/index.html	609 B
examples/getstarted/build/main.********.js	638 kB
examples/getstarted/build/runtime~main.********.js	4.27 kB

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