hotline #56365 fix html5 validation

library/ZendAfi/View/Helper/RenderTable.php

@@ -112,7 +112,7 @@ class ZendAfi_View_Helper_RenderTable_Header extends ZendAfi_View_Helper_BaseHel
   public function _renderColumn($column) {
     return $this->_tag('th',
                        $column->getLabel(),
-                       $column->getOptions());
+                       $column->getOptions() ? $column->getOptions() : null);
   }
 }