fix the issue where group of a hole with an object it doesnt touch

caused an error

Author: madhephaestus

src/main/java/com/neuronrobotics/bowlerstudio/scripting/cadoodle/Group.java

@@ -73,13 +73,17 @@ public List<CSG> process(List<CSG> incoming) {
 			if (intersect)
 				result = intersect(solids);
 			else
-				result =solids.size()==1?solids.get(0): CSG.unionAll(solids);
+				result =solids.size()==1?solids.get(0).clone(): CSG.unionAll(solids);
 			Color c = result.getColor();
 			if (hull) {
 				result = result.hull();
 			}
-			if (holecutter != null)
-				result = result.difference(holecutter);
+			if (holecutter != null) {
+				if(result.getBounds().isBoundsTouching(holecutter.getBounds())) {
+					result = result.difference(holecutter);
+				}
+			}
+			
 			result.setIsHole(false);
 			result.setColor(c);
 		}