Category-based permission check not working on Home Page

Tags "m_CheckPermission" and "c_HasPermission" doesn't work, when used on home page (index.tpl template).

This happens, because current category is detected as "0" on that template, however it's 1 (ID of "Content"/"Home" category). In 4.x versions of In-Portal it indeed was 0. I supposed not all places were properly adapted to such ID change.

I propose, to set current category id ("m_cat_id" variable) to actual ID of "Content"/"Home" category, when it's equals to "0".