优化:当槽加深+槽深度等于0时,拆单数据返回走刀数据

src/GraphicsSystem/ToolPath/FeedingToolPath.ts

@@ -212,6 +212,7 @@ export class FeedingToolPath extends Singleton
         if (!knifeRadius) knifeRadius = 3;
         if (addDepth)
             thickness += addDepth;
+        if (thickness < 1e-5) return cus;
         shape = shape.Clone();
         shape.Z0();
         this.GrooveAddSize(shape, addLen, addWidth);