dblayeroo: whereAdd "IS NULL" : do not add the value as it doesn't exists

git-svn-id: https://svn.fournier38.fr/svn/ProgSVN/trunk@3816 bf3deb0d-5f1a-0410-827f-c0cc1f45334c

dblayeroo.php

@@ -1826,6 +1826,16 @@ class dblayeroo
       $operator = "~";
     if ($this->driver === "pgsql" && $operator === "NOT REGEXP")
       $operator = "!~";
+    if ($operator === "IS NULL")
+    {
+      // Operator without parameter
+      $this->whereExpression[] =
+        $this->sep.$this->tableprefix.$this->table.$this->sep.".".
+        $this->sep.$field.$this->sep." ".$operator;
+    }
+    else
+    {
+      // Operator with parameter
       $hash = md5 ("$field, $operator, $value");
       $this->whereExpression[] =
         $this->sep.$this->tableprefix.$this->table.$this->sep.".".
@@ -1837,6 +1847,7 @@ class dblayeroo
         "value"=>$value,
         "hash"=>$hash,
         "type"=>$this->fieldTypeLight ($field));
+    }
     return $this;
   }
   /* }}} */