fix notice when reading options
fix notice when reading options

  -h option failed due to a notice :

Notice: Undefined offset: 3 in /home/agallou/Projets/Gitboard/gitboard.php on line 380
Call Stack:
    0.0013     483768   1. {main}() gitboard.php:0
    0.0013     484580   2. pflow_getopt() gitboard.php:15

if we used gitboard with the -h option, the pflow_getopt returned an
array with an h key with null. So the isset on that returned false and
the help was not displayed.

KuiKui/Gitboard