Non-present sections should not throw an exception with the

strict_variables option

src/Mustache/Compiler.php

@@ -328,7 +328,11 @@ private function block($nodes)
 
     const SECTION_CALL = '
         // %s section
-        $value = $context->%s(%s);%s
+        try {
+            $value = $context->%s(%s);%s
+        } catch (Mustache_Exception_UnknownVariableException $ex) {
+            $value = "";
+        }
         $buffer .= $this->section%s($context, $indent, $value);
     ';
 
@@ -403,7 +407,11 @@ private function section($nodes, $id, $filters, $start, $end, $otag, $ctag, $lev
 
     const INVERTED_SECTION = '
         // %s inverted section
-        $value = $context->%s(%s);%s
+        try {
+            $value = $context->%s(%s);%s
+        } catch (Mustache_Exception_UnknownVariableException $ex) {
+            $value = "";
+        }
         if (empty($value)) {
             %s
         }

src/Mustache/Exception/UnknownVariableException.php

@@ -38,4 +38,4 @@ public function getVariableName()
     {
         return $this->variableName;
     }
-}
+}

test/Mustache/Test/Exception/UnknownVariableExceptionTest.php

@@ -41,4 +41,4 @@ public function testPrevious()
         $e = new Mustache_Exception_UnknownVariableException('foo', $previous);
         $this->assertSame($previous, $e->getPrevious());
     }
-}
+}

test/Mustache/Test/FiveThree/Functional/StrictVariablesTest.php

@@ -0,0 +1,38 @@
+<?php
+
+/*
+ * This file is part of Mustache.php.
+ *
+ * (c) 2017 Enalean
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * @group lambdas
+ * @group functional
+ */
+class Mustache_Test_FiveThree_Functional_StrictVariablesTest extends PHPUnit_Framework_TestCase
+{
+    private $mustache;
+
+    public function setUp()
+    {
+        $this->mustache = new Mustache_Engine(array('strict_variables' => true));
+    }
+
+    public function testStrictVariablesInSection()
+    {
+        $tpl = $this->mustache->loadTemplate('{{#wrapper}}{{name}}{{/wrapper}}{{foo}}');
+
+        $this->assertEquals('bar', $tpl->render(array('foo' => 'bar')));
+    }
+
+    public function testStrictVariablesInInvertedSections()
+    {
+        $tpl = $this->mustache->loadTemplate('{{^wrapper}}{{foo}}{{/wrapper}}');
+
+        $this->assertEquals('bar', $tpl->render(array('foo' => 'bar')));
+    }
+}