Issue #3487819 by grimreaper, pdureau: Links prop type normalization: empty item

src/Plugin/UiPatterns/PropType/LinksPropType.php

@@ -99,6 +99,9 @@ class LinksPropType extends PropTypePluginBase implements ContainerFactoryPlugin
         unset($value[$index]);
         continue;
       }
+      if (empty($item)) {
+        continue;
+      }
       if (!isset($item["title"])) {
         $item["title"] = (string) $index;
       }