[Lens] show the "Requires field" validation message for empty visualization for inline editing #178393
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Fixes #178237
In inline editing, the 'requires field' message appears even when the chart is empty. This behavior differs from the Lens editor, where the message is not shown when the chart is empty. The reason for this difference is that in Lens, we can easily start from an empty state and the chart workspace reflects it. However, in the inline Lens editor, we render the last correct state in the embeddable even if configuration is empty.
Adding this warning will help users understand why the state in the embeddable is desynchronized.