default tab completion + plot chat for merged plots

Bukkit/src/main/java/com/plotsquared/bukkit/listeners/PlayerEvents.java

@@ -542,7 +542,7 @@ public class PlayerEvents extends com.plotsquared.listener.PlotListener implemen
         if (area == null || (!area.PLOT_CHAT && !plr.getAttribute("chat"))) {
             return;
         }
-        Plot plot = area.getPlotAbs(loc);
+        Plot plot = area.getPlot(loc);
         if (plot == null) {
             return;
         }
@@ -559,8 +559,11 @@ public class PlayerEvents extends com.plotsquared.listener.PlotListener implemen
                 String spy = event.getFormat();
                 spy = String.format(spy, sender, message);
                 pp.sendMessage(spy);
-            } else if (plot.equals(pp.getCurrentPlot())) {
-                recipients.add(((BukkitPlayer) pp).player);
+            } else {
+                Plot current = pp.getCurrentPlot();
+                if (current != null && current.getBasePlot(false).equals(plot)) {
+                    recipients.add(((BukkitPlayer) pp).player);
+                }
             }
         }
         String full = format.replaceAll("%plot_id%", id.x + ";" + id.y).replaceAll("%sender%", sender).replaceAll("%msg%", message);

Bukkit/src/main/java/com/plotsquared/bukkit/util/BukkitCommand.java

@@ -71,6 +71,6 @@ public class BukkitCommand implements CommandExecutor, TabCompleter {
         for (Object o : objects) {
             result.add(o.toString());
         }
-        return result;
+        return result.size() == 0 ? null : result;
     }
 }

Core/src/main/java/com/plotsquared/general/commands/Command.java

@@ -394,6 +394,28 @@ public abstract class Command {
         return cmd;
     }
 
+    public Command getCommand(Class clazz) {
+        for (Command cmd : allCommands) {
+            if (cmd.getClass() == clazz) {
+                return cmd;
+            }
+        }
+        return null;
+    }
+
+    public Command getCommandById(String id) {
+        Command exact = staticCommands.get(id);
+        if (exact != null) {
+            return exact;
+        }
+        for (Command cmd : allCommands) {
+            if (cmd.getId().equals(id)) {
+                return cmd;
+            }
+        }
+        return null;
+    }
+
     public boolean canExecute(PlotPlayer player, boolean message) {
         if (!required.allows(player)) {
             if (message) {

Sponge/src/main/java/com/plotsquared/sponge/util/SpongeCommand.java

@@ -55,7 +55,7 @@ public class SpongeCommand implements CommandCallable {
         for (Object o : objects) {
             result.add(o.toString());
         }
-        return result;
+        return result.size() == 0 ? null : result;
 }
     
     @Override