Index: trunk/core/units/configuration/configuration_config.php
===================================================================
diff -u -N -r7855 -r8015
--- trunk/core/units/configuration/configuration_config.php	(.../configuration_config.php)	(revision 7855)
+++ trunk/core/units/configuration/configuration_config.php	(.../configuration_config.php)	(revision 8015)
@@ -59,7 +59,7 @@
 				  	'Fields' 		=>	Array(
 				  								'VariableId'	=>	Array ('type' => 'int', 'not_null' => 1, 'default' => 0),
 										        'VariableName'	=>	Array('type' => 'string','not_null' => '1','default' => ''),
-										        'VariableValue' =>	Array('type'=>'string', 'default'=>''),
+										        'VariableValue' =>	Array('type'=>'string', 'default' => null),
 										        'ModuleOwner'	=>	Array('type'=>'string', 'default'=>'In-Portal'),
 										        'Section'		=>	Array('type'=>'string','not_null' => '1','default'=>''),
 											),