Undefended center rooms in NW area

[CBoon]

In the NW corner-ish zone of the map there's a number of center rooms that have the usual 3 rich sources but are without keepers or lairs (like W23N45, W44N44, W44N34... really most of those on the bottom right corner of the 3x3 square).

[artch]

Fixed, thanks for reporting.