Fix some more issues

BauSystem/BauSystem_Main/src/de/steamwar/bausystem/region/Region.java

@@ -46,9 +46,9 @@ public interface Region {
 
     Area getArea();
 
-    Optional<Area> getBuildArea();
+    Area getBuildArea();
 
-    Optional<Area> getTestblockArea();
+    Area getTestblockArea();
 
     Optional<File> getGameModeConfig();
 
@@ -56,6 +56,55 @@ public interface Region {
 
     interface Area {
 
+        Area EMPTY = new Area() {
+            @Override
+            public boolean isEmpty() {
+                return true;
+            }
+
+            @Override
+            public Point getMinPoint(boolean extension) {
+                return Point.ZERO;
+            }
+
+            @Override
+            public Point getMaxPoint(boolean extension) {
+                return Point.ZERO;
+            }
+
+            @Override
+            public Point getCopyPoint() {
+                return Point.ZERO;
+            }
+
+            @Override
+            public boolean inRegion(Location location, boolean extension) {
+                return false;
+            }
+
+            @Override
+            public EditSession copy(boolean extension) {
+                return null;
+            }
+
+            @Override
+            public void reset(@Nullable SchematicNode schematicNode, boolean extension) {
+            }
+
+            @Override
+            public void forEachChunk(BiConsumer<Integer, Integer> executor) {
+            }
+
+            @Override
+            public boolean isChunkOutside(int chunkX, int chunkZ) {
+                return false;
+            }
+        };
+
+        default boolean isEmpty() {
+            return false;
+        }
+
         Point getMinPoint(boolean extension);
 
         Point getMaxPoint(boolean extension);