Game saved invisibly at start of hub maps

[Nash]

Reference thread:

http://forum.zdoom.org/potato.php?t=7346

Basically, this would be useful for hub maps.

When there aren't any saves or autosaves present, the game should restore everything like it was when the player enters the map.

The current behaviour puts the player in a pistol start eventhough the map is part of a hub when there aren't any saves - this will ruin everything.