rename method to isEmptyGuild() so as not to confuse with GuildState.

src/engine/workthreads/HourlyJobThread.java

@@ -183,7 +183,7 @@ public class HourlyJobThread implements Runnable {
 
                     // Open Errant Mines
 
-                    if (mine.getOwningGuild().isErrant()) {
+                    if (mine.getOwningGuild().isEmptyGuild()) {
                         mine.handleStartMineWindow();
                         Mine.setLastChange(System.currentTimeMillis());
                         continue;