#421: Setting Empty Border Radius on Tab Item Errors and Breaks Tab Item Content

- Adding `preview_converter`

Author: bluemwhitew

app/code/Magento/PageBuilder/view/adminhtml/pagebuilder/content_type/tab_item.xml

@@ -41,7 +41,7 @@
                         <style name="border" source="border_style" converter="Magento_PageBuilder/js/converter/style/border-style"/>
                         <style name="border_color" source="border_color"/>
                         <style name="border_width" source="border_width" converter="Magento_PageBuilder/js/converter/style/remove-px"/>
-                        <style name="border_radius" source="border_radius" converter="Magento_PageBuilder/js/converter/style/remove-px"/>
+                        <style name="border_radius" source="border_radius" converter="Magento_PageBuilder/js/converter/style/remove-px" preview_converter="Magento_PageBuilder/js/converter/style/overlay-border-radius"/>
                         <style name="justify_content" source="justify_content" persistence_mode="read"/>
                         <style name="min_height" source="min_height" converter="Magento_PageBuilder/js/converter/style/remove-px"/>
                         <style name="margins" storage_key="margins_and_padding" reader="Magento_PageBuilder/js/property/margins" converter="Magento_PageBuilder/js/converter/style/margins" preview_converter="Magento_PageBuilder/js/content-type/row/converter/style/margins"/>