issues/138--metadatadate-validation-error --> 1.0.0 #139
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See #138
Here we create a special purpose override of \Drupal\webform\Plugin\WebformElementBase::getElementSelectorInputValue at \Drupal\webform_strawberryfield\Plugin\WebformElement\MetadataDateBase::getElementSelectorInputValue
It attempts to apply the selector to the MetadataDateBase form element and get the value. We handle both single and multiple value versions of the field. If the selector results in an array,
we return it unless it is empty. This will trigger a array to string conversion notice downstream in \Drupal\webform\WebformSubmissionConditionsValidator::checkConditionTrigger, but that's ok/appropriate.