Don't attempt to unlock if locks aren't in use
Don't attempt to unlock if locks aren't in use
SEL-Columbia/TileStache,SEL-Columbia/TileStache,jbants/TileStache,SEL-Columbia/TileStache,MetGIS/TileStache,Billups/TileStache,jbants/TileStache,jbants/TileStache,MetGIS/TileStache,Billups/TileStache,TileStache/TileStache,TileStache/TileStache,TileStache/TileStache,MetGIS/TileStache,Billups/TileStache