Fix for undefined index

PHP Notice:  Undefined index: document in /home/stefan/Projects/garrcomm/PHPWord/src/PhpWord/Reader/Word2007.php on line 65
PHP Warning:  Invalid argument supplied for foreach() in /home/stefan/Projects/garrcomm/PHPWord/src/PhpWord/Reader/Word2007.php on line 65

Author: Stefan Thoolen

src/PhpWord/Reader/Word2007.php

@@ -62,6 +62,9 @@ public function load($docFile)
         foreach ($steps as $step) {
             $stepPart = $step['stepPart'];
             $stepItems = $step['stepItems'];
+            if (!isset($relationships[$stepPart])) {
+                continue;
+            }
             foreach ($relationships[$stepPart] as $relItem) {
                 $relType = $relItem['type'];
                 if (isset($stepItems[$relType])) {