#8 Patch for gantt strtotime errors

[Philip X]

Path for the problem described by matt.
https://sourceforge.net/forum/message.php?msg_id=3202904

Warning: strtotime() [function.strtotime]: Called with
an empty time parameter. in
D:\www\revefm.esseclive.com\website\projectbench\project\gantt.php
on line 141

Warning: strtotime() [function.strtotime]: Called with
an empty time parameter. in
D:\www\revefm.esseclive.com\website\projectbench\project\gantt.php
on line 142

Warning: date() [function.date]: Windows does not
support dates prior to midnight (00:00:00), January 1,
1970 in
D:\www\revefm.esseclive.com\website\projectbench\project\gantt.php
on line 144

[Philip X]

project/gantt.php fix - replace your file with this (v1.5 to v1.6)