#37 "more" command fails if morebuffer == null

[Kender]

When an actor (player) has no "morebuffer" state, the
'more' command fails.

In Playercommands.cs (rev 1.156 line 4983) there is no
check for a null "morebuffer"

Suggested fix:

object stateBuffer = actor.State["morebuffer"];
string oldbuffer = string.Empty;
if (stateBuffer != null)
{
oldbuffer = stateBuffer.ToString();
}