Fix passing null to trim()

Author: javaDeveloperKid

Inline.php

@@ -60,6 +60,10 @@ public static function initialize(int $flags, int $parsedLineNumber = null, stri
      */
     public static function parse(string $value = null, int $flags = 0, array &$references = [])
     {
+        if (null === $value) {
+            return '';
+        }
+
         self::initialize($flags);
 
         $value = trim($value);

Tests/InlineTest.php

@@ -288,6 +288,7 @@ public static function getTestsForParse()
     {
         return [
             ['', ''],
+            [null, ''],
             ['null', null],
             ['false', false],
             ['true', true],