logilab-database #70253 sqlserver helper failure on some sql_add_limit_offset calls in CW [validation pending]

sometimes int('some arg') fails because we are called without a column index.

priorityimportant
typebug
done in1.6.2
load1.000
load left0.000
closed by#c3cf9b35da61 [sqlserver2005] accept different types of arguments in sql_add_limit_offset (closes #70253)