Fix /0 error (It's a poor fix but it works)

src/main/java/com/volmit/iris/object/IrisJigsawStructure.java

@@ -125,7 +125,7 @@ public class IrisJigsawStructure extends IrisRegistrant
 					avg += getLoader().getJigsawPieceLoader().load(i).getMax2dDimension();
 				}
 
-				return (avg/pieces.size()) * (((getMaxDepth() + 1) * 2) + 1);
+				return (avg/(pieces.size() > 0 ? 1 : pieces.size())) * (((getMaxDepth() + 1) * 2) + 1);
 			}
 		});
 	}