Fix raw lookup when key doesn't exist

Resolves #3

Author: theodorejb

src/Runtime.php

@@ -79,9 +79,9 @@ public static function encq($var): string
      * @param array<array<mixed>|string|int>|string|int|bool|null $v value to be output
      * @param int $ex 1 to return untouched value, default is 0
      *
-     * @return array<array<mixed>|string|int>|string The raw value of the specified variable
+     * @return array<array<mixed>|string|int>|string|null The raw value of the specified variable
      */
-    public static function raw(array|string|int|bool|null $v, int $ex = 0): string|array
+    public static function raw(array|string|int|bool|null $v, int $ex = 0): string|array|null
     {
         if ($ex) {
             return $v;

tests/RegressionTest.php

@@ -1123,9 +1123,8 @@ public static function issueProvider(): array
             ],
 
             [
-                'id' => 256,
-                'template' => '{{lookup . "foo"}}',
-                'data' => ['foo' => 'ok'],
+                'id' => 3,
+                'template' => 'ok{{{lookup . "missing"}}}',
                 'expected' => 'ok',
             ],