BREAKING CHANGE: Render default fallback with empty `projectableNodes`.
When passing an empty array to `projectableNodes` in the `createComponent` API, the default fallback content of the `ng-content` will be rendered if present. To prevent rendering the default content, pass `document.createTextNode('')` as a `projectableNode`.
For example:
```ts
// The first ng-content will render the default fallback content if present
createComponent(MyComponent. { projectableNodes: [[], [secondNode]] });
// To prevent projecting the default fallback content:
createComponent(MyComponent. { projectableNodes: [[document.createTextNode('')], [secondNode]] });
```
Fixes #57471
PR Close #57480
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