allow the value side of config lines potentially be empty.

web/includes/config.php.in

@@ -42,7 +42,7 @@ while ( !feof($cfg) )
         continue;
     elseif ( preg_match( '/^\s*#/', $str ))
         continue;
-    elseif ( preg_match( '/^\s*([^=\s]+)\s*=\s*(.+?)\s*$/', $str, $matches ))
+    elseif ( preg_match( '/^\s*([^=\s]+)\s*=\s*(.*?)\s*$/', $str, $matches ))
         define( $matches[1], $matches[2] );
 }
 fclose( $cfg );