Show "About Me" tab in profile by default

[MarkFL]

I found this thread searching for a way to set the "About Me" tab as the default tab when visiting user profiles, and so I created the plugin and it worked well on my dev site (vB 4.2.1 ), but when I implemented it on the live site (vB 4.2.2 PL2), it did not work. I found though that if I removed the conditional, and just used as the Plugin PHP code:

PHP Code:

$vbulletin->GPC['tab'] = 'aboutme'; 


then it works. However, I do not want to just remove the conditional:

PHP Code:

if (!$vbulletin->GPC_exists['tab']) 


without knowing what its purpose is or what problems this could cause. Could anyone shed some light on why we want the above conditional?