Executed file can be NULL

So revert this part to what it was originally.

Author: nikic

Zend/zend_exceptions.c

@@ -207,7 +207,7 @@ static zend_object *zend_default_exception_new_ex(zend_class_entry *class_type,
 base_ce = i_get_exception_base(&obj);
 
 if (EXPECTED(class_type != zend_ce_parse_error || !(filename = zend_get_compiled_filename()))) {
-zend_update_property_str(base_ce, &obj, "file", sizeof("file")-1, zend_get_executed_filename_ex());
+zend_update_property_string(base_ce, &obj, "file", sizeof("file")-1, zend_get_executed_filename());
 zend_update_property_long(base_ce, &obj, "line", sizeof("line")-1, zend_get_executed_lineno());
 } else {
 zend_update_property_str(base_ce, &obj, "file", sizeof("file")-1, filename);