fix null

SE/se-lib/Core/Database/Mysql.php

@@ -913,7 +913,8 @@ class Core_Database_Mysql extends Core_Database {
 								       							    if(in_array('SKIP-PRIMARY-KEY', $options) && ($PRIMARY_FIELD==$INDEX_OF_CONFIG_TABLE))  {
 								       							    	$sql.=" null ";
 								       							    } else {
-								       							    if($ARR_TABLE['FIELDS'][$INDEX_OF_CONFIG_TABLE]->Null=='NO') $sql.=" null "; else $sql.=" not null ";
+								       							    if($ARR_TABLE['FIELDS'][$INDEX_OF_CONFIG_TABLE]->Null=='NO') $sql.=" not null "; else 
+								       							    if($ARR_TABLE['FIELDS'][$INDEX_OF_CONFIG_TABLE]->Null=='YES') $sql.="  null ";  // else die('917 unknown NULL??? '.$ARR_TABLE['FIELDS'][$INDEX_OF_CONFIG_TABLE]->Null.' . Should be or YES or NO');
 								       							    }
 								       							    $sql.=" ;";
 								       								DEBUG_S(3,'add field',$sql,__FILE__,__FUNCTION__,__LINE__);