[10.x] Improved Handling of Empty Component Slots with HTML Comments or Line Breaks

[comes]

This PR is an alternate implementation for the problem that PR #49935 addresses.

A short summary:

Since Livewire is injecting morph markers, we cannot safely ask if a slot is empty or not. The same happens if we add a linebreak or nonprintable characters like whitespaces or tabs. The slot is not empty and should be rendered.

This PR provide a new function $slot->sanitizedEmpty() and the counterpart $slot->sanitizedNotEmpty()

01    <table>
02    @if($slot-> sanitizedNotEmpty())
03        {{ $slot }}
04    @else
05        <tr><td>{{ __('No Results') }}</td></tr>
06    @endif
07    </table>

Please decide which one fits better in the framework.

Please note, the method is renamed into hasActualContent()

[github-actions]

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