message: Add sw_zend_read_property_not_null.
diff: @@ -212,6 +212,13 @@ static sw_inline zval* sw_zend_read_property(zend_class_entry *class_ptr, zval *
  return zend_read_property(class_ptr, obj, s, len, silent, &rv);
  }
  +static sw_inline zval* sw_zend_read_property_not_null(zend_class_entry *class_ptr, zval *obj, const char *s, int len, int silent)
  +{
  + zval rv;
  + zval *property = zend_read_property(class_ptr, obj, s, len, silent, &rv);
  + return ZVAL_IS_NULL(property) ? NULL : property;
  +}
  +
  static sw_inline zval* sw_zend_read_property_array(zend_class_entry *class_ptr, zval *obj, const char *s, int len, int silent)
  {
  zval rv, *property = zend_read_property(class_ptr, obj, s, len, silent, &rv);
  