From 03807fc73367c7d0b839635d6b0ff5dc8276d88a Mon Sep 17 00:00:00 2001
From: Christian Flothmann <christian.flothmann@qossmic.com>
Date: Fri, 12 Aug 2022 19:15:06 +0200
Subject: [PATCH] do not clean up whitespace text nodes inside if tags

---
 src/Node/IfNode.php                    |  5 ++++-
 tests/Fixtures/tags/if/empty_body.test | 26 ++++++++++++++++++++++++++
 2 files changed, 30 insertions(+), 1 deletion(-)
 create mode 100644 tests/Fixtures/tags/if/empty_body.test

diff --git a/src/Node/IfNode.php b/src/Node/IfNode.php
index 8ba23ddb60..e74ca523b0 100644
--- a/src/Node/IfNode.php
+++ b/src/Node/IfNode.php
@@ -50,8 +50,11 @@ public function compile(Compiler $compiler)
                 ->subcompile($this->getNode('tests')->getNode($i))
                 ->raw(") {\n")
                 ->indent()
-                ->subcompile($this->getNode('tests')->getNode($i + 1))
             ;
+            // The node might not exists if the content is empty
+            if ($this->getNode('tests')->hasNode($i + 1)) {
+                $compiler->subcompile($this->getNode('tests')->getNode($i + 1));
+            }
         }
 
         if ($this->hasNode('else')) {
diff --git a/tests/Fixtures/tags/if/empty_body.test b/tests/Fixtures/tags/if/empty_body.test
new file mode 100644
index 0000000000..9b11ae033b
--- /dev/null
+++ b/tests/Fixtures/tags/if/empty_body.test
@@ -0,0 +1,26 @@
+--TEST--
+empty "if" body in child template
+--TEMPLATE--
+{% extends 'base.twig' %}
+
+{% set foo = '' %}
+
+{% if a is defined %}
+
+{% else %}
+    {% set foo = 'NOTHING' %}
+{% endif %}
+
+{% if a is defined %}
+
+{% endif %}
+
+{% block content %}
+    {{ foo }}
+{% endblock %}
+--TEMPLATE(base.twig)--
+{% block content %}{% endblock %}
+--DATA--
+return []
+--EXPECT--
+  NOTHING