From d7859470ea6dbf851546c06a26273ad2f69c00e9 Mon Sep 17 00:00:00 2001
From: Manuel Adan <adan@arcovia.com>
Date: Tue, 4 Feb 2020 19:13:15 +0100
Subject: [PATCH] Adds pattern fields with no value to the render as empty

---
 src/Element/Pattern.php | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/Element/Pattern.php b/src/Element/Pattern.php
index e04ea99a..e65d8047 100644
--- a/src/Element/Pattern.php
+++ b/src/Element/Pattern.php
@@ -88,9 +88,12 @@ public static function processFields(array $element) {
       $fields = $element['#fields'];
       unset($element['#fields']);
 
-      foreach ($fields as $name => $field) {
+      $definition = UiPatterns::getPatternDefinition($element['#id']);
+      foreach ($definition->getFields() as $field_definition) {
+        $name = $field_definition->getName();
         $key = '#' . $name;
-        $element[$key] = $field;
+        // Enforce that fields with no value are rendered empty.
+        $element[$key] = isset($fields[$name]) ? $fields[$name] : ['#markup' => ''];
       }
     }
     else {