[BUGFIX] Allow rendering of pages context on a root page

If rendering a path without a record context, the renderer
automatically resolves the current page as context.

However if this page is a root page (pid is 0) then
the RECORD content object refuses to render this page
if `dontCheckPid` is not set.

Catch this situation and set this configuration if needed.
[CLEANUP] Enforce array in dispatcher constructor
Revert "[BUGFIX] Initialize page generator in dummy page generation script"

This reverts commit da4c2750ff8e022c9581a4e82b8ef09136937429.

While the intention is good, the dummy script is the wrong place
to initialize the rendering, as rendering happens before this
script is included